Everything is relative. If your timber is easily accessible and you have equipment to move it, a bandmill is a good choice. It takes thinner cuts, cuts more quickly, and should make more uniform lumber.
If your timber is less accessible, a chainsaw mill will get it done. Mill the log where it falls, and get the lumber and beams out from there. Boards and cants are lighter than the logs they're milled from. You can cut uniform lumber with an Alaskan mill, but it takes longer, makes more sawdust, and may not leave as smooth finish. At least you can carry the Alaskan and chainsaw to the log.