Maybe yes for after 25 December. But before 25 Dec Nxt seems to be better choice because of free ignis.
Ehm .... No.
For 1 NXT (40 cent, current price) you get 0.5 IGNIS.
For 1 ARDR asset (44 cent) you get 1 "real" ARDR coin.
ARDR is the base currency of the platform, while IGNIS is a child chain. So which one, do you think, will be worth more? At least, I would be very surprised if IGNIS was worth 2 times the value of ARDR after the launch. I expect both to have about the same value, with ARDR at a little advantage.
And NXT after the snapshot will crash hard - I expect not more than 10% of the current value.