A tent is a tent, they all do the same thing. I’d go with an ac infinity or mars hydro, good thick outer shell and serviceable zippers. You’re biggest issue is gonna be temps. Even in cooler climates attics get pretty warm, you’re going to need air conditioning. Especially if you’ve got enough lighting 150x150 is gonna need at least 650w led or 1000w hid if you plan on using the whole area.