Difference between a Jumper and a Exersaucer? Do you need both?

Tara415

Hey, I'm a FTM and wondering, what's the difference between a Jumper (Jumperoo?) and a Exersaucer? I have an exersaucer that I haven't used yet since LO is only 11wks old, but I've seen the jumpers at BRU and BBB and was wondering if I should get one... Any benefits compared to the exersaucer? Can LO use it sooner? Thanks!