Being an instructor of many years now, I prefer a student show up with a 40-60 size glow trainer. The biggest reason can be time.

With an electric you need to have at least two batteries and a quality peak charger. Flight 1 with pack A. Put pack A on charger. Flight 2 with pack B. Put pack B on charger. Flight 3 with pack A.... It can be difficult to get in a lot of flying time in a short period with e-power unless you invest in at least 3 batteries. JMO.

I guess it comes down to the fact that I like to get a student at least an hour of flying time in per session. And that can be hard to do depending on the plane, number of packs, pack capacity, hours available at the field...

Other than that I really dont care too much. Id rather a person show up than not at all.

You might consider getting in touch with the clubs you mentioned and see what their instructors prefer. My bets on the Alpha since the bigger stuff is easier to see at a far distance.

Cheers.