What size pots to use?

I wanna buy smart pots, i already have 6 5 gal buckets with wholes at the bottom, is the yield that big of a difference between a 5 gal and a 3 gal? what do yall prefer I go with? 850w hps light, 4x4 tent i was thinking about fitting (includeing my 6 buckets) like 8-10 under the light. comments,tips, concerns?

I like 5 but I veg for abit.

Bigger the better. More pot space more room for root growth

ok ill get the five i guess

First thing to do is set up the tent and place your 6 5-gallon pots inside. Looks to me like you will be crowded with just the 6 in there, eh?
It's always a good idea to set up everything you can ahead of time as you try to anticipate problems. I think you'll find very little "extra"
room in a 4 x 4 tent after spreading a half-dozen 5-gallon buckets around. In fact I suggest you will not have enough room to flower 6
5-gallon buckets in a 4 x 4 tent. Move down to 2-3 gallon pots and you can flower that many a lot easier.

Also, you are going to have a problem with your plants growing into the lights due to your small growing space. You may want to top your
plants early in veg so they don't get too "leggy". By topping I mean remove the top 6-8 inches completely. Not just a FIM job. You are trim-
ming the top because you want your plants to grow shorter. Best scenario is remove the top at 4 weeks vegging. By then the top is able to be a clone.
Clone the top and give the donor mom 4-5 days to recover, then flower her.

Keep thinking fast and short. Limited space means you have to grow them fast (so they don't outgrow the room) and short. Short means cut the veg period
down as much as possible and use smaller pots with daily watering.

Good luck, BigSteve.