backup on the computer vs iCloud?

I have to restore my phone and I was worried about what data I would lose. I used to backup my phone via iTunes on my Mac until this past October when I had a backup error and lost everything on my phone, so now I use iCloud. (this might sound really dumb) but before I was gonna do the restore, I was backing up my phone and I thought about if I would lose the data for one of my games that I have been working on for months so I looked in the iCloud settings under documents and data and it wasn't even listed there. so now I have no idea if it's backed up or not and I really don't wanna risk losing it. so if I switched back to manually backing up my phone via iTunes, would that save it? also one problem I was thinking of was that last time I tried to restore my phone from a computer backup when I got my 6 Plus, it didn't work and basically looked like it was a brand new phone setup. I also had it backed up to iCloud at that point so I just used that one instead. so I'm not really sure what I should do. I might just test it on my iPad because I don't have much on there. if you have any info for me, thanks in advance!