i’ve tried both, and i would say you should get the hitman pro. the atmosphere is a bit heavier than i like, but it’s still a good yo-yo. atmospheres great for 1a, but unless you like heavy yo-yo’s, get the HP.
I like the Atmosphere for 1A; doesn’t feel like a rock to me, but it is very heavy. Way more rim weight than the Hitman Pro (brass instead of aluminum, right on the edge, away from the axle), so it has the potential to outspin it and be less susceptible to tilting during fast play.
They’re very different yoyos, so I don’t have an opinion about which is better. I love how smooth the Hitman Pro is with the solid spin axle. My Atmosphere is pre-solid spin, but now that they come with the solid spin axle, I can’t speak to the smoothness. I like the rounded edges of the Hitman Pro more than the sharp edges of the Atmosphere. The Atmosphere grinds better with its textured plastic.