Which foam roller should I buy? Are the ones with spikes better? Are those expensive brands really better?

Foam rollers are fantastic self massage tools with many benefits. (You can read about 5 lesser known benefits here.) This massage is done by using body weight to apply pressure on your back, legs, arms, and areas and is great for all sorts of muscle aches and pains. It can also be used for stretching, mobility, strengthening and proprioceptive exercises.