I have found straight-line quilting to be much more satisfying over time, in part because I find it easier and in part because I'm so much better at it than FMQ! I love Jacquie Gering's book Walk, which is about quilting with your walking foot (her Craftsy classes are also excellent). There's a ton of variation in what you can do--straight-line quilting can be as visually interesting as FMQ, in my opinion. I agree with everyone who says do what's the most fun for you!