I've got little kids and a demanding career that I could be called into at any time so dut to all of that I spend a good amount at the local trackman simulator. It's nice being able to do other courses around the world. It definitely doesn't fully replace getting out on the fairways and greens but I've been able to lower my handicap a couple strokes. I like the data it provides with swing speed and spin rate and some of those things it provides as well.
Either is great with me. That being said, I've got 3 young children and a very demanding career so most of the time it's 9 holes for me. My oldest (9) is starting to get into golf and comes with me alot of the time