I would say the A319, as it’s just an awesome little plane, not to mention cute. However, there is a bug in Infinite Flight with the A320 family that makes the nose slam down extremely hard the second you touch the ground when you land. (if spoilers are activated) I find this the most annoying thing ever as I look like I’m on a mechanical bull, bumping down the runway to all the other Live pilots and it’s just really unrealistic. The Q400 is a nice plane, with great physics and handling. It is up to now that I have yet found any problem with this plane. The cockpit is great, the liveries are endlesss and beautiful… After reading this, you’re probably going to buy the Q400, but to further help you, try landing the FREE A321 and see if the nose slamming down is a problem for you.
Thanks and Happy Flying,
Qantas VA Group Pilot