For your situation (one year old RV), I would choose Protect-All. It is an excellent light-duty cleaner/wax that is very easy to apply, basically wipe-on and wipe-off. Leaves a nice shine and 6-12 months of protection. If you had an older coach with more oxidation or "black streaks", I might choose something with more polishing action, but those also require more elbow grease. If you use a light duty product like Protect-All regularly, you should not ever need a stronger product.
Everybody has a favorite car/RV polish and they all work decently. However, you probably don't need any extra cleaning/polishing action and certainly no machine buffing, so you can focus on the "easy to use" part more than the "restores the shine" aspect.
Nu-Finish is an excellent product but more appropriate where the surface is oxidized or very grimy. Hopefully a one year old RV hasn't reached that stage.