For me the .40 are easier for me to load the 9mm felt too small.
getchu one of these, they're one of the biggest quality of life improvers for shooting UpLULA® – 9mm to 45ACP universal pistol mag loader watch out for fugazi ones esp on amazon, nimrodswares.com has real ones for the low
I haven't looked into it so this is probably not real but if it's hard to load in my opinion it means its new and good quality.
shyt there's a few times I order some new magazines and them shyts be stiff (no homo). I usually load them to full capacity and leave them loaded for a while, could be a week, 2 weeks or 2 months then when I go shoot and unload and reload usually they are fine.
I did order some extended magazines for a rifle loose booty ass springs feel like bent up paperclips.
I've bought a few guns that came with some doo doo magazines. All soft and shyt. Don't feed properly for shyt. You just throw those away and get a reputable magazine.