For strength and durability the Sun is a better choice. The Rhyno Lite and the Mammoth are heavier than the mavic 517. If you are like me and are a heavier rider (190-200) then the Sun will outlast the Mavic. The terrain I ride on out here in central Texas is very rocky and can get very hard depending on rain. When I first moved here I was running mavic 117 SUP on Nuke proof hubs. Then I switched to the Mavic X 217. I promptly burned up both mavic hoops, then switched to Sun. I am now running Rhyno Lites laced to Nuke hubs and haven't even had to true them yet. It does help though, that instead of a machine they were hand built (by me).I even use the Sun sub IV on a Breezer Jet Stream with XT hubs, although they do not take big hits as well as the Rhyno Lites they have held up better than the Mavic's I once used. Not to bash Mavic but for me and my riding style mixed with the terrain out here the Sun is a better choice.
To address your other question, YES the LX hubs are fine. I still have one from an older rig now disassembled that has over 5000 miles on it. Besides the missing decal there is nothing wrong with it at all. Like anything else though the more you keep it up the longer it will last.