I would always do it through the site and not on a cell phone. unless there really is no other option. have ever read stories of people who had a bankroll of 1000 mbtc and then want to bet 100 mbtc, but due to the wrong press on the phone, that bet became 1000 instead of 100. on the pc it is a bit clearer
Can confirm, it's way easier to make mistakes on phone while betting or using anything that specially has something to do with numbers, and that's mostly because of touch screens so you have to be extra careful using them, I lost count how many times I pressed the wrong buttons or input the wrong number while using these sorts of applications on phone.
That being said having an application could solve a lot of issues and make it somewhat easier to work with, it's great that they're acting quickly and already working on mobile app now and as they said it should released in about 2 weeks so if you're mobile user you can wait till then.