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depends on how much head height you have and how much you can afford to lose. We used the 175 ones because the existing joists gave us about 200mm of space and 375 total was enough. There is a point where extra insulation gives diminishing returns and you should be aware about not blocking off the eaves.
Sumo
Loft legs. Any reason why I should use the 175mm instead of the 300mm legs?
Loft is boarded, but straight onto joists, then previous owners had a company in who just threw insulation on top of boards. The plan is to lift boards and reinstall insulation (buying more), with legs and then board, creating usable storage.
Surely more insulation = better.