This depends on what your plans are for DPP.
If you have Flynn at R3 and Fullarton at F8, then when Flynn is ready to be traded you can conceivably trade him into a forward (via Fullarton DPP), or maybe even a midfielder or defender if your DPPs are set up correctly. Trade Flynn into Lloyd, maybe?
If you chop Fullarton from F8 now, then when you chop Flynn you'll only be able to trade down into a rookie. It will cost you an extra trade to use the cash from Flynn if you don't have Fullarton (or another F/R) as a forward.
So based on this, I'd do the trade that doesn't involve Fullarton.