I see we've managed to veer nicely off topic.
Apologies to anyone who may feel offended by what I say next. It's not my intention to pick a fight.
So... more recognised? That's a heck of a question. What do you mean by "more recognised"? Does this mean "more widely known by Joe Public?" Or does it mean: "bigger fan base with more coming off it and inspired by it?"
I actually met someone last weekend who thought "Knight Rider had something to do with a bike?" But to be fair he only knows about Doctor Who because of the awesome popularity it's currently enjoying. He just wasn't a TV person.
Perhaps you could look at the merchandise. Doctor Who has had a steady stream of stuff marketed by the BBC since the sixites with Annuals produced every year for 20 - 30 years (they've started again), books based on the episodes, followed by new stories, comic strips consistently since 1964 (I think?). Toys since the same year. You could say "that's just the BBC marketing" but then would there be that much stuff if there wasn't a demand?
Conventions: Wooh! You can't move for Doctor Who people turning up at conventions both Doctor Who and general cult/Sci Fi. On your side of the Atlantic, dear Colonials (giggle) we've recently had Comic Con with Torchwood (Dr Who spin-off) and Doctor Who (classic and new) alumni appearing. That was followed immediately by Gallifrey One in LA. I think there's also Chicago TARDIS. Doctor Who conventions are a quarterly or even monthly thing.
Compare to Knight Rider's Festival and Knightcon, there's clearly more mileage to be had from Doctor Who appearances. I mean seriously, how many times would fans turn up to see David Hasselhoff raise his thumb? Whereas I know fans have listened to Nicholas Courtney's "Eyepatch" story on an actual yearly basis!
Fan groups! Does anyone hang out down the pub on a monthly basis entirely to talk about Knight Rider? Every City and a fair few towns in the UK have Dr Who fan groups (as well as the official Dr Who Fan Club). There's a monthly meeting in London to which writers and performers on the current series used to attend. (I'm assuming they don't now in case they get mobbed.)
In Knight Rider's favour you've got the real hardcore fans and entire companies dedicated to replica manufacture. Very, very cool. Would love to own one or three. But over here and in the States (and likely across Europe) we've got TARDISes springing up all over the place. Sylvester Stallone owns one. Fact.
Have a look on YouTube. Type "Doctor Who fan film". Now scroll down. Click Next Page. And next. And next. That's right: legions of us making Doctor Who movies in which we/ our brother/ our toys/ our dog is the Doctor!
Look up user Cyberrob and his awesome new special effects for classic Who or his new Davros project.
Also, to see more fan Doctors in one room than is really healthy: search "PUDSAI". Very cool production and even better if you've seen some of those Doctors in action in their own movies.
Try the same for Knight Rider? Oh look edited clips of KITT to a "rocking track". OMFG FTW ROFL and LOL... really not that inspiring, in my opinion. Some very nice images of people's replicas um... driving... to the store... um... and back. But they are nice looking cars.
I think it's safe to suggest here that Doctor Who has produced more inspiration across the board than Knight Rider. Or maybe we're just bigger geeks?
Countless interviews in Doctor Who Magazine (Do you have a Knight Rider magazine? DWM's been going for 30 years and it's just getting bigger and better) with really big people in the Production have said: "I watched Doctor Who as a child and that's when I knew I wanted to be a writer/ director/ producer/ scientist/ musician etc. etc. etc." Not just Doctor Who either. We have fans all over the place who are (in recent years) very vocal about it.
I think it's had a longer run up. Dr. Who has been going for 46 years now and though it had a brief *coff 16 years coff* break with one not-quite successful US excursion, it's got an appeal that is a lot more solid than Knight Rider. But it's not because it was marketed better, it's because it has the long term appeal of a go-anywhere do-anything story. I think therefore it gets a wider audience than Knight Rider.
Don't get me wrong, I'm not bashing Knight Rider, but Dr Who's appeal is so much more universal.
It's not based on any one nation and it's principals, so it doesn't alienate anyone who might look on its host Country with negative feeling.
Dr Who doesn't solve problems with a gun. Again, don't get me wrong. I love action stuff, with Michael and KITT facing huge oppresive odds and KITT whipping out a laser/ rocket launcher/ machine gun is awesome. But seeing a man talking an alien invasion into blowing itself up is somehow MORE impressive. I suppose it's a cultural thing...
Oops, I seem to have turned my post into: "Doctor Who is better than Knight Rider" thing, which I don't believe. They are equally good and different. (Although Dr Who is better

)
I think that the only way to really test this would be to get two photos: a TARDIS and KITT and walk around Cities in various countries saying: "What are these?" I'm willing to put money (50p) to bet that worldwide more people would recognise Doctor Who over Knight Rider. But that's because I'm a fool with my money.
Thank you for reading.