What I love about the 6200 as my first Mac piece is that I never outgrew it. I ran it as stand alone integrated amp, then pulled the jumpers and ran it into the 2205 as a preamp when I wanted to add more power. It has done duty as both int & pre since then in various systems and is currently running a pair of Quad 22L2’s at my parents house.
As much as I love the esthetics of the earlier Mac gear like the 6100 (of which now I have many pieces of the earlier gear) the 6200 has more of the modern Mac look and is a bit more timeless. I too like the matchy-matchy when applicable, particularly with the Mac stuff (how can you not). The era of the 6200 had far more options for power amp matches (2155, 2205,2255 and all of the 7xxx series) which can provide monoblock options on those for mega-power set-ups if you eventually want to drive difficult speakers like Maggie’s. Plus the MR75 and 78 tuners match as well.
I think the 6200 is the best of the gateway drugs into having a very versatile unit for under $2k that you won’t really outgrow.
Both vendors mentioned have great reputations so I think it would just come down to who had stock in hand, and who is offering the better deal on what you want.