Billion 7800dxl vs Asus DSL-N66U vs Asus RT-N66U

[Cold_And_Miserable]

Which is best?

Billion, Asus or separate modem + Asus?

Priorities:
1) Reliability
2) ADSL2 sync speed
3) VDSL sync speed when FTTC available
4) LAN speed
5) consistent wireless speed