Creative mode. With worldedit, voxelsniper etc.

survivl

I'm good at survival but I could see myself maybe being better with creative because of the unlimited resources.

I usually do multiplayer survival

I don't think you can be 'good' at creative mode, unless you are judging how good one's building skills are. I personally use Creative mode mostly to test out redstone or command things.

I play Survival mode much more than Creative mode though, so probably Survival.

Survival with my friends!!!!!! or creative for redstone tinkering

2 words. multiplayer survival

I love creative because as you said you are completely free, but I like survival as well. It depends.

I usually use creative mode to design redstone contraptions, farms, and stuff like that. So then I can copy it on my vanilla.

I also think playing survival with friends is WAAAAAY better, especially with free server hosting sites.

this made me realize i haven't played in creative mode in at least a year now, what the hell
im a survival player, more smp style with friends so it's not just me on my own; i build little towns and villages, usually fantasy/medieval styles, and make up world lore as i go to make it more interesting for myself!
i also play "casual hardcore" where i build the things i normally build, except in hardcore?? there's a strange appeal to it, and lucky for me i dont die a lot in the first place so it's not that much different actually!

creative!

if by creative you mean "build nice structures" then i suck at creative, mostly because i use this mode to test for my survival world, like redstone contraptions or quirks. i love building stuff in survival because the fact that you have to gather everything makes it that much more valuable to me.

I like building, but I've mostly only been playing snaps to test the new features, or older versions (b1.7) in Survival mode so that I literally can't go into Creative mode and make a house.