CMC gets my vote
For me (no vested interest, but have seen a fair number of EFB setups) the CMC product is one of the best options out there (if your owner can be sold on it - it is expensive): -
1. It can be mounted in the cockpit with a dedicated power supply. You avoid the disastrous 'power leads all over the cockpit' bs.
2. It is removable easily from its dedicated stand (you could have a small bag for one and plus a small portable printer and there is your travelling office).
3. The CMC 1100 I had experience with had retractable keyboards and were wireless capable.
4. It is robust and its buttons can be operated by opposable thumbs, one of the best options in turbulence - allowing you to keep your hands on the yoke and use fingers to steady your selections. This is virtually impossible with most tablets I have seen (I have horrible trouble with the Fujistsu on rough/dark nights - and heaven forbid you drop the touchpen under your seat or have to use your big fat fingers on its tiny selections in turbulence).
5. The cockpit mode selections and chart orientations were intuitive.
6. Battery life was good enough to last for reasonable IMC/Night recovery time with an electrical failure.
A good product and I would highly recommend an older aircraft cockpit have two of these in the cockpit and a third one with a small printer as the 'hotel set' - thereby (if permitted by your authority) getting rid of the worlwide Jepp set and allowing you to operate with just the Jepp Chart and General volumes....
Good luck with whatever way you go. I hope your owner (and authority) can be sold on it. Worldwide Jepp amendments are a drag.