It's hard for me to discuss the differences between the #1s and the #2s because I have only had young #2s and #1s with at least four years of age on them. This is in addition to the fact that I personally like robustos the least out of all vitolas.
I have found, in my short time smoking, that in habanos that have a robusto and a corona gorda variation, like the JL Seleccions and HdM Epicures, the corona gorda comes across as more balanced cigar in every regard.
The Mag 46 was my first habano, and of course my first love, but since I have had time to sample more and more different habanos I really haven't found myself going back to the Mag very much, if at all. It is a damned good cigar but, like Craig has stated, it is rather lacking in complexity. In young 46s it seems that all you get is a sweet tobacco flavor with very little spice or kick to it.
Like I said before though, if you ordered all of them you would likely sell the fivers off before the vendor could even charge your card.