I don't have a favourite these days, though I used to subscribe to Inernational Modeller.
If I can be bothered to go get off my backside and actually visit a good newsagent, which tends only to happen when I have a bee in my bonnet about buying some new equipment, (like now!) I have a good rake through what is on the shelves, usually quite a good selection, and buy one, perhaps two of those magazines that particularly appeal to me on that day. It was just Model Rail on this occasion and I am still enjoying it although some of the ads with dense lists really DO need a magnifying glass to read these days!