The wife and I both had our own 100's hundy's and loved them. I was building mine as an overlander.
Have to admit after getting the GX the hundy was not quite as capable as the GX for off road, but you have the truck for that.
Did you get the hundy with the factory rear e-locker?
Tundra wont be seeing any off road action, not for a long time anyway. No rear locker but they are in the plans, I have an ARB bumper and winch waiting to go on first. I really couldnt say which is better off road but I have found the less I care about a vehicle the better it is off road lol Was always worried about putting scratches/dents in the GX or messing up the interior. With the 100 not woried about any of that. More room for wife, toddler, dog and gear is a plus as well.