AE/ICS is the same thing.
Really, honestly? The best stock MP5 is a Classic Army M4. MP5 mags are hard to load fast, it has a funny grip angle, terrible cheekweld solutions, and if you wanna put an optic on it, it's sort of dorky.
Barring serious sense and reality, the TM one will be your best bet. The AE MP5s are preupgraded ICS MP5s, and they're pretty junky. I had one a long time ago.
I'm sure the Classic Army one is OK too now that they have the new B&T trademarked ones. Pretty much everything Classic Army makes NOW is generally pretty excellent.