Hallmac once bubbled...
and as Instructors you should too!
I teach SSI which means I have to teach out of a shop, no independents. As part of the shops responsibility they provide jacket BCs, regulators and consoles, weight belts and tanks with the course. They also (recommend using the equipment the shop sells)
As the expert the students paid for, My job is to teach them how to become great divers. Therefore I wear what I believe in and how I believe it should be done based upon my training and real world experience. ( after all that is what makes us the expert right). I have found it is easy to do both and stay with what the shop sells. If I don't match the equipment used by the students as provided they ask why! I then get yet another chance to educate them and improve their knowledge.
As we all know students want to be like their instructors. So why match the rental stuff and give them the wrong message that it is the best stuff. Show them how to use the stuff they have and how to use the gear you believe in and why you belive it. Alot of them will get the good stuff so they can finish the course with it. which means you don't have to deal with poor equipment issues.
Secondly when they see you using gear they don't have and understand why you have it they won't spend hard earned money on the wrong equipment only to learn it really doesn't do what they wanted it to. So you save them money in the long run which means again you educated correctly. All agency's allow you to do more than required so do it and be the best you can in all aspect. That includes equipment choice.
Hallmac