I always advise starting in smaller pots to make most efficient use of your space. Remember you are going to get around half males, maybe some herms that have to be killed, and maybe a couple lame plants that you will end up culling.

So if you start in the pot you are going to end in, in a restricted sized area, you will end up with empty space at the end.

Start 3-4x the number of seeds you want to see grow to harvest, in pots that are... obviously.. 1/4-1/3 the size or less of your final pot size.

That way after you cull out the runts, males, and chicks with dicks, you will have just about exactly the right number of plants to fill the space using the final big pots.

Get it?