I'm not an expert on resistance bands but this is some info I've found, hope it helps.
Buy a variety of bands. Most bands are color-coded according to tension level (e.g., light, medium, heavy, very heavy). It's best to have at least three - light, medium and heavy since different muscle groups will require different levels of resistance.
Buy comfortable, easy to use bands. Some bands you find in stores offer interchangeable handles, which means you have to take them off and on to use different bands. Some have handles that are larger than normal or made of hard plastic. These are minor issues, but they can make using your bands more difficult than it needs to be. Try to buy bands with padded handles and make sure you don't have to change them out.
Buy accessories. One key to using bands is having different ways to attach them. If you have a sturdy pole or stair rail in your house to wrap the band around for exercises like chest presses or seated rows, you may not need much more than bands. But, if you don't, you may want a door attachment. You can also buy ankle cuffs, different handles and other accessories.
Keep it simple. There's a wide variety of bands available - figure 8's, double bands, circular bands, etc. If you're just getting started, stick with your basic long tube with handles. Once you figure out how to use it, you may want to buy other types later for variety.
Anyhow, what will you be doing with the resistance bands will be a factor when coming to decide which band to get. What are u planning to do with the bands?
