The freeware aDosBox is definitely too slow. I just got DosBox Turbo and it works well. I like that it has portrait support, even though I'll usually play in landscape. I have not tried anDosBox, so I can't compare them.
You can get DosBox Turbo here: https://play.google.com/store/apps/details?id=com.fishstix.dosbox
If you go the Turbo route, you will definitely want the companion app DosBox Manager https://play.google.com/store/apps/details?id=com.fishstix.dosboxlauncher
To setup MOO2, I created a new profile in DosBox Manager. Under Advanced DosBox Config, I made these changes:
Memory Size: 16MB
Frame Skip: 0
These are the same settings GOG's dosbox config uses. The 16MB is essential, but I don't know if frame skip makes any difference. I haven't figured out the right audio settings to make the sound good, but it's acceptable, and I usually don't play without sound anyways.
I also modified Autoexec.bat to autolaunch the game.