I have thunder thighs and the LG Neo Power fit me perfectly.
I really don't care much about how I look in cycling shorts (I'm plenty dorky already in my hi-viz jerseys and the way your legs look when you're walking around in cleats ), but those shorts are very long and they have a very wide lower hem in place of grippers, so there isn't any "sausage" effect, either.
ETA - any cycling shorts should be snug enough to prevent jiggling. I don't wear compression gear on the bike, but they should fit like a second skin. Shorts shouldn't bunch up no matter how long the ride - that's another sign that they might be too large.