I’ve owned several rollator walkers and I’ve got Firm opinions on what you need.
A difference of a few pounds might not seem like much to you but it is important. When you’re going up some steep steps or getting into a car on your own, it’s far too easy to over-balance if you have a heavy rollator. Go for the lighter model, even if it iis more expensive.
when you want to travel by car or sit in a restaurant, you need your rollator walker to fold down as much as possible.
How well attached are the handles? I’ve got one walker where the handles slip off. This has caused me to fall badly and to have problems picking them up again.
Every machine I have tried has had loose brakes after a month or two. So the big question is to ask how easy it is to tighten them again. Some models you need help, others are easy to fix. Also, how are the brake cables arranged? Are they going to snag the furniture?
The bigger the wheels, the better. You’ll be able to tackle more types of terrain and badly-maintained side-walks. This can make a huge difference to your mobility.
Some rollators have a plastic seat and some have a seat made from material. Neither is very comfortable but the plastic seats give you much more stability to use your hands. However, the plastic seats weigh more and are difficult to fold up small.
You will be much more comfortable sitting down if you have support for your back. It gives many of the advantages of being in a wheelchair.
You need to be able to carry things around. You can balance them on the seat but they have a tendency to fall off. Much better to have a bag with a zip.