Las Vegas and canyons in february-march

With the RV, its easier to keep the destinations flexible. If we rent a house (or two rooms in an hotel as we are 7 people), its non refundable at the last minute so we will have to stick with our choice. And that choice is pretty limited because of the number of people and our budget (I went through all the houses to rent in Airbnb and VRBO and even the cheapest ones are pretty expensive so the choice was very limited). So I have to reserve early to be sure to have : a-something b-something not too expensive.

I did the calculations for both (RV + campgrounds, or van + house/hotel room, and gaz) and it's pretty much the same (a little cheaper for the RV).
Thanks for your advices, its much appreciated!