Lululemon wonder under low rise?

Just wondering if anyone had lululemon wonder under low rise leggings cause i always buy the high rise ones to suck in my fat and stuff but these are on sale online and i wanna buy stuff that's on sale so i dont spend a lot of money cause lululemon isnt cheap 😂 All the reviews online arent good so i was just wondering. Also should I size up or down? im a 4 i think but they're too tight so my last pair i ordered is a 6 and i'm gonna try them on when i get home 😂