Sprog is the man for this but I will try to give you some idea. There are some brands selling the same type of stilts but at different prices and stuff. So it might seem a little complicated at first. And to some extent more money doesn't mean better bocks. And what is your budget?
PoweriSers cost £200 (come with cuffs and upgraded bindings). They are made in korea. The springs are stiffer on these compared to other stilts. Parts are probably harder to get hold of than other stilts. I don't know much about them. The hoofs probably last a bit longer than they do on projumps.
The stilts I'm about to describe are all from the same factory. They are identical, apart from any branding. It's only prices that vary.
PoweriZers are not called poweriZers any more. Any poweriZers are old stock. They have been rebranded as flyjumpers. Prices vary between £150-£200 for the basic model without cuffs or upgraded bindings. There is no point in buying this brand.
Projumps are £135 for the basic model or £169 for the model with cuffs and upgraded bindings. They also have a great customer service.
Projumps are great first stilts. Great price. Great service. The springs are quite easy to master and the frames last really well to if you look after them. If your budget is under £200 projumps are probably your best option. Don't look at flyjumpers because they are more expensive and dont have the great customer service. There is nothing amazing about powerisers to make them the right choice. Projumps
If you have more money to spend you might look at 7's. These do have different springs. They are easier to compress but are not for everybody. The price recently went up to £300. I don't think the possible benefits of the stilts are worth the extra money but many people love the springs. The frames weigh more than projumps or powerisers.
Powerskips are for pros. They cost like £700 or something silly. Awesome springs and light frames but only worth it if you are dedicated to the sport.
