With Ayshford coming along well in the centres, plus with the signings of Daniela and Brown, we probably dont need Collis so its probably a good thing for us with team balance that he is leaving and good for Collis himself.
In saying that, I think Collis is better then Brown and so i think the Sharks may come out better with the trade that has virtually been made between the 2 sides.
If Collis reached his potential, probably him. But since he hasn't peaked yet and injuries continually cruelling him, I would take Gallant on his current form.