iConnectmidi 2+ or 4+?

Obviously iConnectmidi 4+ is superior but it's also more than twice the price and I am wondering if I really only need a 2+. My set up currently:



Macbook

iPad Air

BSII

MicroKorg XL

Arturia 49 key The Laboratory

LaunchControl + Launchpad mini

Scarlett 18i8 (Audio Interface)

Powered USB Hub



What I was originally looking for was just a way I could get bidirectional MIDI and audio between Mac and iPad. So anything from a iPad synth into my Mac DAW on channels as desired (either MIDI synced to transport or not), to using the iPad as an outboard FX VST for a track in my DAW, to using my iPad as a controller for my Mac DAW or DJ programs. Perhaps even recording into an iPad DAW like Auria something from my MicroKorg or BSII. That's about it.



I noticed to keep my iPad charged I will need the separate power adapter at $35. So that would roughly make the iConnect 2+ $100 cheaper than 4+. I do have the option of bus powered or not which I don't think the 4+ has. The 4+ has some really nice additions but if I could afford more equipment to hook up I'd probably have the cash to just buy the 4+ too. I do however like the idea of 4 (two stereo pairs) as oppose to 2 so I could potentially record more at the same time, but no big deal doing all one at a time.



At any rate any input as to whether the 4+ might be worth the extra investment at this point in time? It seems for my needs the 2+ is fine. Also if anyone runs iconnectmidi 2+ as an aggregate device currently can you tell me if I am then locked into a max of 24bit 44.1K or can I run my Scarlett at 88.2K and the iconnectmidi 2+ at 24bit 44.1K?



Thanks!

iConnectmidi 2+ or 4+?