My preference is Lycoming. I have owned two brand new 0-360s. The latest in my 7A. Lyc makes them to Van's Specs and they fit perfectly using Van's install kits. I liked the fact that I could get parts from Van's that worked properly with the engines and I didn't have to reinvent any wheels. I also like the fact that Lycoming has always stood behind their engines and provide bulletins if there is a problem. I got two year warranty that started after the engine was first run, a month before I flew it, 8 months after I got it. There may be other fine engines out there, but this is why I chose Lycoming.
I like Lyc,
Roberta
