I'm at Travis now and have to say I enjoy it a lot more than RONing at Dover. I'm not sure what you're thinking job wise? I'm assuming something C-17 related? They're both single squadron C-17 bases so there's not much difference as far as the work end if you're C-17 aircrew. I've been in 3 C-17 squadrons and there's a lot more similarities than differences. So basically it comes down to location. if you enjoy skiing in the mountains, surfing real waves, eating good food, and drinking fine wine, choose Travis. if you enjoy Nascar, guns, and Amish furniture, choose Dover. Also unless you are a rock star, you probably won't be offered a choice between the two...second assignment conversations usually involve something more like this:
CC: Well they're looking for IPs at Altus...
You: I'll go anywhere but there, anywhere!
CC: Well I have this slot to Dover I could probably swing for you
You: Dover sounds amazing
PM if you want more details about Travis, in all honesty there are pluses and minus to living in California, but I feel that the pluses outweigh the minuses.