OP, if you can get buried electrical service, I'd sure go for buried as never have to worry about tree trimming, etc that is hassle with aerial. What do neighbors have?? How far from PoCo lines to your building??
Already have existing power to house?? Aerial or buried??
Also, don't go anything under 200A from PoCo if they'll do it at same price as 100A. Lot easier to start out with 200 so you can subpanel off that for other buildings that might need power later.
Lots of variables . . . . fill in blanks so GJ sparky's can give best advice.