The only reason I sleep on my stomach is because of my back issues. The hammocks I used in Thailand were so comfy that I almost instantly fell asleep on my back, which I could NEVER do on a mattress.
Definitely leaning more towards the Brazilians. I have a $100 Amazon gift card and the ones I'm liking and have great reviews are from NOVICA - namely this one and this one. This LA SIESTA hammock has great reviews also.
This one has great ratings too, but is a Mayan.
Not sure which to go with. I had $300 set aside for a loft bed (but now I'm leaning towards the hammock), plus that gift card.