Gas is king. The control to dial in close to a specific temp, quicker pre-heat, and overall convenience greatly trump any preconceived flavor differences from a wood fire.
An oven with a 16" floor would be a great place to start for a beginner. A little more room to work with. And the obvious, bigger pizzas for a family of 6.
I do agree it's not a bad idea to just buy a stone for the home oven and do a few in there first. See if it's actually something they enjoy, before investing in a dedicated oven.
