Currently use the Walmart model, has one broken/repaired strut but has survived 3 seasons without too much grief (~12 TDs/yr). Just need to make sure you anchor it well. Benefit is that in its cover it is comparatively small vs the more beefy models.
I actually prefer the design of the Caravan from Costco, but had replaced 3 (yes 3) on consecutive track days since the plastic mechanism they use to keep the legs extended kept popping its cover and spring across the parking lot. Could have been a bad batch as I've never read any such problems from others, but the Walmart canopy uses the same simple design you see in the Impact canopies. Caravan's just seems stupidly complicated for holding a leg up.