It really depends on how much money you are going to spend. If your budget is not very large, like mine was, then I would go with a stationary wheel, because the lower end strollers with swivel wheels seem to wobble really bad, even when they are locked into place. The higher end ones, on the other hand, are just that - higher end. The BOB in particular is great, but costs an arm and a leg.
We purchased two different strollers, both around the $200-$300 dollar range (these were double strollers so while this is pretty expensive, they were still the lower end) and both with swivel wheels. The first one was a InStep Safari TT (or something like that) and it was terribly wobbly; the second was a Baby Trend Expedition and it had the same problem. We took them both back and ended up with an InStep Runaround and we love it. The front wheel double forked and locked into place. My one and only complaint is that the seats kind of slump into each other - a problem you probably would not get with a more expensive brand.