Lower armholes will cause less movement. A higher armhole allows one to raise their arm without pulling up the side seams of the garment. Also, I think part of the problem home sewers have with sleeve fitting is the poorly drafted commercial patterns (I am referring to the 'big 4' here only). Generally they have very balanced sleeves - front and back sleeve cap matches. There is also way way too much ease in the sleeve cap on these patterns.

RTW may allow more movement with the lower armholes, but they also generally fit rather poorly.