Originally Posted by
vanwormer
Dynaryder makes a good point! I had a Trek with 105 components which provided very smooth and effortless shifting. Last year I bought a new Trek with Ultegra components. The difference is striking - much smoother, quicker, and quieter shifting. But as pointed out above, it depends on what the better shifter is worth to you. If the price is close and you feel like spending some extra money, go for it. Doubtful that it'll make you any quicker, but you might enjoy the ride more.
I'll just point out that you're apparently comparing old 105s to new Ultegra. If that's what you're doing, you might even find that new 105s would be nicer than old Ultegras.
That doesn't invalidate your point, however. To the OP, if you really want to know, ride both. For most of us, the difference is small.