Does anyone know the safest bitcoin wallet? I've heard it's Armory, but I haven't seen any proof, I've only heard armory mentioned once in a while. Is there and program that can prove it's worth?
It armory is as safe as people say, would it be larger that bitcoin qt, or more RAM intensive?
It depends on what you define as safe.
Personally I use Armory because I think it is safer than other options. It uses bitcoin core for networking so it uses a full node and thus doesn't need to trust someone else to provide the right data like an SPV wallet does. It also uses and HD wallet, although that wallet type and the master key format and key derivation is a separate thing that is not a BIP standard. But this HD wallet feature also eliminates the problem that Bitcoin Core has.
Some of the problems with armory though are the additional databases it creates and the huge memory usage of the program. There is also the fact that support for further development for open source armory seems to be dying, but I hope that changes.