IMHO a slider is probably a little less accurate than a regular compound
miter saw. However, technique in moving the blade without applying side
force might help a little.

When I bought a mitre saw a few years ago I debated the same question. I
ended up buying a standard 12" mitre saw in lieu of a slider or a 10"
machine. My thought was that the larger blade would provide a little more
capacity. Also, when space permits, I can pick up a good, used radial arm
saw pretty economically.

RonB