Oh ok, then the choice between the straight axles and portal axles is up to you but to be honest,
I love portals.
If you order the portals, you might also get a pinion gear to make up for the reduction you get from the portal axles.
They run slower.
You will have a lot more crawling room in the rocks with the portals.
The hub carriers tend to hang up on the rocks a bit more than the standard but the tradeoff is worth it.