Bumpstop extensions are evil uptravel robbing mods that should be avoided if possible.
Removal/modification of the fenders, or at least a BL to get them up out of the way, etc...are preferable to losing uptravel.
Depending upon the terrain you wheel on, the ground clearance, and/or flotation of bigger meats is typically valuable enough to make sacrifices to get.
If you lose uptravel, it means the truck rises with the terrain, instead of the truck staying level, and the tires going up/down by them selves.
In off camber and/or uneven terrain, this can lead to less stable positions, a bad thing.
So, you want the uptravel, and you want the ground clearance.
If you are a flat lander, and your articulation is limited to mud, you might bias your choices in that direction...if you do rocks/rough terrain, you might bias it in THAT direction, etc.