I have flown both and owned an arrow if you have a bit of training the arrow will be more fun for a longer time then the alpha
some things I would say to do to either of them is go ahead and glue the tail on as it's not the strongest setup
and I would add some epxoy fillets on the firewall since it can come loose on a hard landing other the that they fly great
later on with the arrow you can easily add a another servo to the wing for flaperons that makes for even more fun and the flaps are great to slow down the landing speed
JMTC