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As stated already, the short ones are for restricted head room. Currently regs is 270mm loft insulation I think so 300mm gives you space for that + decent air gap.
The boards might not like being walked on unless you have joists above the legs too. I just used the loft zone stuff which includes lightweight metal joists for not a massive price (their boards are a rip-off though)
Polygon
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.