Steve
If this is for the vector mini playfield - by all means try the 2" flipper. There is an ongoing debate in the vector brotherhood as to whether the upper playfield should have a 2" flipper (looks right, but very hard to make controlled shots with it) or a 3" flipper (looks too big, but plays better). The manual quotes one flipper, the flyer shows another
But I would say try both for a couple of weeks and decide which you prefer.
Vector's mini playfield is very, very easy to drain from any one of the three ramps. Time in the mini playfield is always very short. I think the 3" plays much, much better. I tried the 2", tried to like it, but could not. Yes a 3" looks too big, it looks too fat, it partly blocks the middle ramp into the mini playfield. But it is nigh impossible to shoot the ball up the middle ramp from the left upper flipper anyway, even with a 2" flipper there