Hello & welcome
I feel the topics here are more explanatory. If you've ben hear a year and read the threads you should notice a different clientele. Not that anyone is better, just diffent. AC seems to lean toward DYI and more obscure electronics for instance. Take the "Solid State" topic on AC, it is very slow, not many new topics and lets face it "Solid State" is broad. AS has specific topics for preamps, amps, integrated, etc. AC has more diverse forums like "Open Baffle", forums for a couple different genres of music. If you have been on both sites I really don't see how you haven't noticed a difference.
AC has a big following of independent manufacturers. I find this a positive and unique to the extent AC has participation. For example, when Frank VanAlstine was alive he was very active in his own forum on AC.
In general, most sites are similar in layout. You just have to hang for awhile and see where you feel you fit. Which may be several sites. Which site tweaks your own interests.