Hi PipBoy,
I build both, and see better conversions with freesites, which I think is the 'norm'. As stated many times before, although ratios are certainly a part of things, don't get *too* hung up on them, overall sales are what counts. A good freesite that also gets good SERPS will probably make more sales and give you a better ratio, but a well done gallery can bring in 8 or more sales in the relatively short time it is 'live' at TGPs (although you can still do ok in the SERPS too generating longer term sales).
I pretty much still suck at galleries, I've not been doing them for TGPs that long and as focused as I'm trying to do so now, so my sales are still a long way off what experienced gallery builders can make. Hell, my free sites aren't exactly brilliant lol, but yeah, generally the conversion rates are better on freesites, due to a number of things like targetted SE traffic, more space and allowed text to sell the sponsor, longer live listings at LLs that do well in the SES, etc.
I am seeing things improving though, so if you have the time (and lets face it, a few changes to a freesite gallery to fit TGP rules and that type of surfer doesn't take *that* long) then I'd say give it a shot
