I've a 2x2 and 3x2 the 2x2 is ok but given the option a 3x2 is a better size imo, I've space for clones mums and seeds it covers everthing, being 3x2 regular trays etc fit no problem, in my 2x2 my heater or trays dont fit.
The 3x2 is easier to keep cool in peak summer there's no need to change from t5s...I do because I'm tight but it's not really necessary.
A foot doesn't sound like a great difference I get that but it's like there's acres in my 3x2 lmao!
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2x2 tray and room for my prop or my bubble cloner.