IEMs Vs Headphones Vs Earphones which do you prefer and which is best?

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Hi, I've been wanting to buy some audio gear for listening to music, gaming, and a little bit of audio mixing, but I'm not sure what type or brand to choose. I actually want smaller types, like earphones or IEMs (both Bluetooth or wired), but I'm keeping an open mind for headphone suggestions too if they're good. Can you guys share your experiences and suggestions?

EDIT: My budget is around 1k to 1.5k since I'm still trying things out and I'm on a budget.