Advice on Ganesh Shield Troll Nest or Monarch

[FromTheRez]

I like hyperion for best block

This is best of both worlds if you're pressed for requirements, over Troll Nest easily.
if you can spare the strength go Ward or Aegis over that though. Also, style>
Monarch would be the next best
Take Blade Barrier/Troll Nest as very last resort if you can't find any of the above (with style> being considered, Troll over Barrier)