If you are going to shoot a modern compound with a short axle to axle length (less than 40") then it is an absolute must, IMO, to use a mechanical release.
If you want to use fingers then you will find only a hand full of bows that would qualify as a finger bow, and then only barely. You should have a bow that is at least 40" axle to axle.
Another problem with today's modern bows is the hard back wall that you pull against. Most finger shooters I know prefer to have a bow with a "spongy" wall to pull against. There aren't many bows made today that have finger friendly cams.