I just swapped from XL jets to Turtles. Whilst with a size 10 boot I could get into jets they were not as comfortable as I would of liked. Turtles fit better with the correct spring straps whcih reduce the lateral play- I had some custom made to get the correct size but others cut down the agir straps. UE have the agir or
Spring-Straps.com
You best bet is to find somebody local with a pair and try them before you buy if possible.
Ian