Hey Billfisher,
I have used 4 bracket types so far. My assumption is that you want to keep your engine on the bracket for trailering (no duh) like everyone wants to, but bracket manufacturers say will void the warrantee if you do.
The first one was the spindly aluminum kind with a long multi-slotted height-adjustment bar. STAY AWAY! These are good for maybe a 2HP engine if you want to trailer with it.
The second one was a nice (looking) stainless steel one that looked very stout. This one had a crack propogate about 2/3 up an entire weld length before (luckily) Mark Mc noticed it. If he hadn't noticed it, I would have probably left my 8HP Honda on the pavement somewhere between Corvallis and Newport in the next couple of trips.
The third one was a heavy duty OMC like others have posted. It was great. The design resembles aircraft aluminum fittings (I used to design them), with generous radii, thick cross-sections, and good "edge margin" (meat) around bolt holes. I routinely trailered my boat up to Anacortes Washington and had no problems with an 8HP Honda. The only complaint might be that my 8HP didn't weigh enough to push down on the lift-assist; I had to put a lot of weight directly over the engine hood to push it down. ("Hey Mark, hang on to my ankles while I push the engine down")
My fourth bracket came with a boat upgrade. It has hydraulic lift, etc. I don't even want to know how much it cost.... but it does spoil me nicely :grin: