There was a thread a while back that pitted a 250 Mewlon against the 10" AP and I picked the 10" AP on that one.
For that one, the Mewlon had a meaningfully bigger CO, but more importantly, the bench tests I have seen on Mewlons have led me to believe that they are not made to the same high level of perfection that you would get from either the AP or a custom mirror Dob.
Would appreciate if you can point us to these bench tests??
There are quite a few interested people including me that would find this helpful as comparison for future purchases.
Even a bit more off-topic, I have both a AP 10" f/14.6 Mak-Cass and a Tak Mewlon 300CR. If I couldn't get the former, I'd be quite pleased with the latter. They're both wonderful visual instruments for lunar, planetary, globular, and relatively bright DSOs (my 25" Newt is obviously better for viewing the fainter fuzzies).