You can access both depending on your position when opening the forum, when you are at home or have special time to visit the forum, using the desktop version or accessing via computer will be easier for you. Accessing the forum via computer is more flexible than the mobile version, especially when you want to create tables. Occasionally you can open the forum via a browser on Android when you don't have special time to pursue the weekly target of the signature you are promoting. Both can be used depending on the time of day, I prefer using the laptop when doing weekly tasks.
Yeah, it depends on where you are at any point in time, for instance when I'm out and not close to my laptop, i could easily open my browser and login into the forum and navigate all corners of the forum, infact I'm getting more used to navigating the forum with my phone cause I could easily carry it anywhere I go to and login the forum.
But then my laptop is mostly at home and I can't carry it everywhere with me, unlike my phone that's very portable and easy to carry about, it could even fit in my small purse or pocket perfectly, like you said accessing the forum with an Andriod device is flexible and I totally agree with that.
However, I've tried and I've seen that there's a big difference when you explore the forum on a desktop or laptop, it seems easier and the network speed is better compared to when I login with an android device.