I've found the newer Rio boards are a terrific compromise between a traditional narrow longboard, and
something super wide like a Start.
I still like and use the big wide Starts for the first ever lesson for a beginner due to the stability,
but after the first lesson I find most beginners like the slightly better speed and turning ability
of the Rio boards.
So, give them a try and I'm hopeful you will find your students progressing faster with a better overall