AEB-L is a good choice. LC200N is great but is more expensive and not many makers seem to use it. MagnaCut is a cool steel but is special in being high-toughness relative to its edge retention. So it's tough for what it is but not as tough as LC200N, AEB-L, 14C28N, or Nitro-V. At least for me, it would depend on what choices are on the table with your preferred maker and maybe the pricing or waiting period. For instance, if he was doing a run in MagnaCut or something or had some to use and was ready to go, it might be the right choice. If everything was on the table though, I might go with a tougher steel in this case. That's not to say the MagnaCut version would fail you horribly or anything. It could be awesome. Just saying, the ideal is constrained by the real.
That said, Nitro-V has really picked up in popularity over the last few years. I've been seeing it more and more in both production and custom knives. It is related to AEB-L but gives up some toughness, coming in just tougher than MagnaCut according to Larrin's ratings. He rates Nitro-V the same as AEB-L on edge retention and corrosion resistance, which makes it seem strictly inferior. However, I've at least heard anecdotal reports of it being marginally better in those areas. I don't know that it would be my first choice but if offered, it's not bad.
Really though, 14C28N remains a sweet spot. The edge retention is in the same ballpark as AEB-L and Nitro-V but the corrosion resistance is much higher and the toughness is closer to AEB-L. If I was pursuing this kind of knife and 14C28N was an option, I'd choose it in a heartbeat.