well pure-stats wise AS Qubeley is better than the regular B
also, the hand launcher is a double beam on the AS
also, here are the stats for an A-Rank Newtype Arousal:
A rank: Movement speed is increased + Boost duration is slightly increased + Enemy positions are indicated on the radar + Search distance is increased, when the HP of the unit drops below 40%.
however if you're not comfortable with the B Qubeley, I'd say go for something else.
personally, I'd rather get the X Astray in terms of funnel units due to these skills:
A rank: Agility is increased + Reload time is decreased + Search distance is increased, when HP drops below 40%.
Dash duration becomes unlimited, Radar, Search distance increased, when the HP of the unit drops below 50%.
Also, you can eventually get Providence (Legend is only in KR right now I believe). Providence has higher stats than X Astray (but not by much), however it gets an AOE melee and a bit more DRAGOON ammo.