Consoles. Can't stand the philosophy of most mobile games, but I do open Pokemon Go on the occasion since my job has me going to different locations.
I've been more home console games in the past few years since I got a PS4 after I graduated. While I was in college, though, the bus was my sole mode of transportation, so I was playing the 3DS a lot. Seeing my Activity Log records show I played over 1,000 hours for those years. Can't say I regret it. I don't think any system will give me the same experience as the 3DS, with features like Streetpass. But games like FE Awakening, AC New Leaf, and Smash 3DS came at just the right time, when I could still round up friends to play with at any moment. I still frequently play my 3DS, but I can't fathom playing as much as before.
Edit: Y'all need to buy Dragon Quest XI. Incredible JRPG, and I'm excited to replay it for a second time with the Definitive Edition.