I discovered these leggings because my daughter wears the little kid version of these and I loved how her leggings felt - durable, soft, smooth and had the little side pocket just you'd see on adult versions of leggings (I high recommend getting the kids leggings!).I had just bought the IUGA leggings for myself based on Wirecutter's recommendation. They are good leggings. However, I prefer Stelle's leggings more.Stelle's fabric is quite a bit thinner than IUGA. By thin I don't mean see through. I mean it's more akin to what you'd get at Athleta, Vuori, etc. It's an appropriate amount of thickness for yoga or workout class with just enough compression to feel secure. I could also wear these all day (more on sizing later) I can't imagine wearing IUGA leggings for anything other than hanging out/casual wear because they are so thick. I also can't imagine wearing them between the months of April and September because of the thickness.If you like the kind of seaming that provides a bit of style to your leggings, IUGA is a better bet visually. The seams are part of the overall Iook and I got compliments for that reason. But it's not my preference generally - Stelle's leggings have more 'classic' seaming. Not invisible, but not prominent either in my opinion. It's more like a Lululemon Fast and Free type stitching.I still prefer Vuori's Daily Legging or Lululemon's Fast & Free over Stelle, but for the price and I would happily wear these and buy in many colors. I tend to be a size 4-6 and I ended up settling on the Medium. The small was fine, but a little too compressive for casual wear (but perfect for workouts). Something about my build often lands me between sizes in many leggings - same sizing as IUGA as well.Overall I really liked these and would get them in other colors - I'm hoping for more brighter color options! IUGA is better in that department. I will wear Stelle for yoga/workouts & casual wear and I will wear my IUGAs only for casual wear on cooler days. If you prefer a thicker fabric then definitely go with IUGA but if you want something that's more functional for exercise, Stelle is the better option IMHO.