[FTC]: Starting an FTC team which platform?

[Bluejackets]

We are going to teach robotics as a high school class next year in grades 9-12 in our school and I am wondering what platform would be best to use. VEX, Tetrix etc... Before we spend a ton of money on one platform I just thought I would see what opinions are out there.

In addition, We also want to start up an FTC team next year and currently we are involved with FRC at our school. In the future we hope to expand into the middle schools and elementary with FLL

I am the lead instructor and my background is teaching VEX within a classroom setting but I am wondering what would you recommend for a new school starting up an FTC team. Maybe a combo of different platforms. Any advice.

I appreciate your time.