AD is 24/7/365. As a reservist/ANG you still have requirements but beyond meeting those you can choose to participate more at your option. AD that isn't an option.

When "everyone says go reserve" (actually ANG is usually the first choice) at some point you can take the advice or ignore it.

If you're a 'home body' and get into an ANG unit, with major airline crew bases nearby, you'll have hit the trifecta.