Differences between 'Boris and Sentinel?

Drmike

Boris apears to have a much better WOB (better than any unit incl Sentinel)

For me, this reason, if nothing else makes Boris the better unit for deep/working dives.

Weight is important in some cases (even though I have and still do fly boris all over and have never so far had any issue) So to me, for shallower non working dives Sentinel would make travelling a little easier - at the expense of a slightly higher WOB