I think there is very little difference between the quality of these frames. THe only difference I can tell is that the Schwinn seems to require a standard headset, and the Sette requires an integrated headset.
If you are worried about the opinion of others then I would suggest something other than these two bikes - Schwinn for the past few years has developed a reputation for selling mainly dept. store bikes, and Sette is the discount 'no name' frames sold by pricepoint. If you plan to actually ride, as opposed to showing off, both of these will be fine.
But what are you using the frame for? Are you building a bike from scratch? Have you got a bike with a damaged frame but is otherwise complete?