For the ARB, you have to mount the winch before you mount the bumper.
The summit bar does have a new grill with an access door so you can reach into it, It also has more room up top I think.
I have decided to go with the Warn Zeon Platinum 10-S with the wireless remote and no manual clutch lever. Same as the 12-S other than gear ratio, so ill just make sure to keep snatch blocks handy. My rig will be at least 7,000lb when all said and done (Tactical44 rear bumper with dual swings, sliders, gas and transfer case skids, voyager roof rack, etc etc). So I hope the 10,000 lb is sufficient.
I won't have a clutch lever at all with that winch, so I wont care about access other than managing the line onto the drum. I also plan to take advantage of the two accessory power ports on the winch for some 9.5" Intensity lights. I also read that it has a (secret? barely any documentation. ) wire that connects to a high beam wire and lets you select on the wireless remote which of the two lights you want to come on with the high beams. (or you can control them individually or together on the controller).
I have researched fitment some more, the 2013 (mine) shape is slightly different on the lower inboard part of the headlights compared to the 2014+ models. However I am hoping that it wont matter for the bumper. From what I can tell its flat on the arb bumper. I am willing to risk it and deal with slight fitment issues. I dont think it will be an issue though (someone installed this bumper on a RR sport). I put in my (big) arb order yesterday. Going to cost a fortune, but the setup should be pretty nice.