I think it depends on your personal level of wealth/tolerance to liability and comfort with potential partner(s). Personally, I've been in one co-ownership with 4 individuals under a signed agreement taken closely from the AOPA document (no corporation used) and had very good luck.
Just take the time to put everything in the agreement before everyone signs.
I am in a 3 person partnership in a certified airplane. The plane is owned by a Delaware LLC and we have equal shares. Our agreement closely (blindly) follows the AOPA document. Get yourself a lawyer to write yours. I wish we had.
Partnerships are like dysfunctional families. There is always a brat amongst the partners, too. Still, it is the only way I could own & maintain an expensive certified A/C, so you take the bad with the good. And there is some good.
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Roberta Hegy
Built/Flew an RV-7A
Air Troy Estates, East Troy, WI
Ford Expedition and TRICE "Q"
Built Glen L "ZIP" Classic Outboard Runabout and Super Spartan Hydroplane
Glen L Torpedo