I chose a lot of options because the reasons have evolved over time. Initially, it was because my work caused me to move overseas, so it was the only way to keep playing with the group. That is still the case, but I came to like the features and functionality of VTTs for more battlemap focused games.
Finally, with my current game, we decided to go with Warhammer Fantasy Role Play 4e. I wouldn't have run WFRP4e as an in-person game, the crunch, rules spread across multiple books, and all the tables would have driven me nuts if I had to run it in person. But there is a very good WFRP4e game system for Foundry. I love the lore and also like the game mechanics--if I can use the computer for the table rolls and look ups and applying various buffs and debuffs.