I've sat in Cat 1 and Cat 3, but not 2.
How much of a hastle would it be to change your plans? Would you be missing anything by changing the plans?
Cat 2 is either the back of the main floor, or on the center balcony (cat 3 is side balcony). So, it is possible that switching from cat 2 to cat 1 will only get you 1 table closer to the stage. Or, it may move you down from the balcony to a front row table. It's impossible to predict.
So, if you can switch things around with ease without having to miss anything, then go ahead. But, if you would miss things, and it would be a pain to switch it around, then go with the cat 2 seating.