Alex, these are just ways of connecting the Parrot to the car. Both use the Parrot blue box.
I had the connects2 rig on my old Golf (with a CK3000 Evo) and it worked fantastically well, and was totally plug and play. Not a single wire (including a switched live) needed to be messed with. Just plugged it all in and it just worked and brilliantly.
Also, the connects2 brain (a small electronic box) is totally configurable depending if you have the earlier double phone buttons on your MFSW or the later style single ones. Also, as I purchased mine second hand, it didn't come with any instructions. I found that a quick email to quickconnects in the US was all it took, and the customer service from them (especially an individual called Howard) was nothing short of stunning.
The Parrot multican may well have the same functionality, but I have no experience of these.