Sizing is very consistent I find.
What sports do you do, what height are you and do you prefer leggings to feel compressive or not?
Aligns are lovely, really soft but “naked” and “cotton” feeling, great for yoga or casual, but you can train in them too.
Fast and free are my favourite for running, not compressive but have pockets and a tie waist.
Wonder trains are less sleek fabric, slightly more compressive and good allrounders. Have drawstring waist.
All the right places are good for training. I don’t run in mine. They’re more compressive
Ready to rulu are the equivalent of sweaty betty Garry pants.
All tied up tank is a nice one. The scuba hoodie and half zip are really popular for a reason.
The speed tab socks are excellent. I have ones that are 8 years old, worn weekly and still going strong. They might seem pricy but you more than get your money’s worth.
The another mile vest is another safe and popular choice.