Wow, 1 and 3 is a bit young for trampolining I would think.. being so young I’d be leaning toward the little toddler size ones, for safety reasons

We got a Vuly after two cheap trampolines didn’t survive the weather and my kids. The Vuly survived years of storms without damage or being flipped over, any the net was good at keeping them in – no falls.

Hubby bought the kids a cheap one from Big W.
My two kids are also three and one and they play in it just fine.