there are pr's and con's to both
as stated use what ever you like
,
me personally I prefer using known stand sites/tree's
as then I know more or less yardages, what the view will be like, and I am 100% certian I can get in and out with less noise and leaving less scent on the ground doing so
the less energy you exert the less your body has to work and as such, the less scent it will make IMO
carrying in stands and setting them up, even the fastest one's and lightest one's
still cause you to burn more calories than if you wee not carrying one in and setting it up,taking down at end of day and so on!
another pro to set up stands is deer actually get used to them being there over time, all the m ore so if you have them over things like food plots and such, where having a set places stand makes very good sense, as deer hit food plots more consistently, than other food sources!
I typically only use preset stands on either lands I own or have permission to, so, that is a big part of where I use what type of stand!
like said, pro's and con's to both,,use what makes you happy!