How are you with heights?

The bigger the scissor lift, the less they wobble and rock around, but you'll have to compromise on ease of moving about.

Scissor lifts just go up and down, but have bigger working platforms. A cherry picker has reach but a smaller work platform.

Here they have to be tested, I'm not sure if that's a ;legal requirement or a requirement of the insurance companies. That may or may not apply to you, but it would be worth checking.