I use either my iPad mini or iPad Air. I just swap from one to the other when one gets flat I have a laptop that I could use but it takes ages to turn on, and the iPads are so much more portable. I can't imagine someone going on TBT on a PC.
I was like the only kid to grow up without a laptop (I had a desktop) until I was 18. Now I feel like if I'm on my laptop I should be doing college work which is why I finally got one. So, I'm usually on my iPhone because I'm used to it. But sometimes I'll be on my laptop if I know I'll be posting a lot.
Used to mostly use my phone...then my laptop if I felt like turning it on. Now I almost exclusively use my Galaxy Pro Tab. It's big enough to view threads without having to zoom in and way less bulky than my laptop.