How to start looking for a robotics kit for your school/organisation/kids to use:
Start with these questions:
What are we interested in? Maybe some or all of these
- Building and designing
- Block based/scratch based programming
- Real world programming
- School computing syllabus
- Electronics
What do I need it to work with?
- Windows/mac/chromebook etc
- Lego
- Wireless programming
What's my budget?
How many age groups does it need to be suitable for?
How many kids do I want to share each kit?
What are my/our long term goals?
- Run a club for gifted/interested students
- Increase students choosing computing
- Want something for my children to get into
- Home schooling
- Want to make robotics part of the curriculum
What programming languages do we want to teach/learn?
How much time do I have to learn how to use it?
How much time do we have to set it up every time?
There's more, but those are a good start to understand what you are looking for and begin to narrow down your options and make your research much better.