G'Day Stiks,
I thought they handled very much the same, the VMAR is almost an exact copy of the Airsail (I just heard a rumour that Airsail had recently lodged some sort of legal action against VMAR)
The Airsail kit was comprehensive with excellent building instructions and enjoyable to build. Fitting the control surface ribbed PVC skins was fiddly, even the control horns are 'inside' the hinge lines on the flaps, ailerons & elevators, the only visible horn is on the rudder. Really nice cockpit included. Fully balsa sheeted except for mouldings for the cowl, the forward lower section of the fuse, under the wing centre-section and a section just aft of the wing.
The VMAR Tomahawk is much improved over their earlier ARF's.
Nicely presented colour instruction booklet, very basic cockpit detail with one bug eyed pilot !
They must have decided the elevator nyrod was too hard to connect so moulded a cavity into the fin to accept a servo for direct linkage to the elevators. Seems to work OK.
Both were a bit sluggish with the 54 4C, also both seemed a little 'squirrely' through slow rolls and needed heaps of down elevator when inverted (maybe my C of G was a bit fwd.)
With the elevators out of the prop wash they will not 'rotate' on take off until a reasonable speed, likewise you wouldn't want to be a bit too slow on short final (especially if not using flap) as the elevator response is dependant purely on airspeed.
They both look really nice on the ground & in flight. Rate of roll is good, no big pitch changes with flap.
The difference in price is about $50 (plus glues and paint etc for the Airsail) If you enjoy building and are not in a hurry, I'd go Airsail.
Good luck