None. I used to subscribe to FSM the first year when it first came out. Not anymore.
After FSM, I no longer subscribe to any model related magazines anymore. It's always the same old stuff no matter the publication. Weathering, new products, how-to's, etc…
It's fine, if you want to see cool builds and stuff and all. For me, they're not worth the money anymore. Once you see one, you've seen them all. Tamiya only caters to their products only. Not to mentioned, magazine and subscription prices are ridiculous nowadays.
I'd rather buy aircraft related magazines for inspiration for future builds and stories. I love FlyPast, a U.K. magazine and used to buy it monthly. Kinda stopped buying them due to cost of magazine - $13. Haven't bought FlyPast in two years or so. I'm sure they raised their single issue prices by now.