Modular engines are super strong and the ECU is easier to self-tune. But N/A there really isn't too much you can do to them. Pushrod engines have a huge aftermarket. And like was said, they are easier to work on. But the tuning is a bit more involved. If I were gonna go Modular, I'd hit it with some boost and call it a day. If I were gonna go pushrod, I'd do a top-end kit and maybe a stroker.