lol 71 - it's likely both will (be biting...).
Hey Smedley - Allan/North Depot are easy to get to, if North Depot is as far as you want to go then you'll it's likely you will only need to do the Wendigo-Allan portage as you can run the other (or line down if water is shallow). The portage between Wendigo-Allan is short and dry, and it's a very gradual drop in elevation between the two lakes (no long hills to climb or descend). The put in on the Allan side is sandy and shallow, however the put-in on the Wendigo side of that portage, depending on water level, was 4' deep I believe directly below a large flat escarpment of shield rock at the landing. There was also a short (30'?) section of boulders close to the Wendigo landing to navigate, but after that just hard duff if memory serves All the landings at campsites were good from what I saw on both lakes, all relatively flat and well maintained and all the campsites I stayed on had shelves/tables built by previous visitors.
For Allan L sites the island one looked good, and all the central east shore sites had sandy easy nice landings, but not much if any beach when I was there (high water right up to vegetation).
North River is a nice lake with no portaging, just a tangle of alders to get through early-on navigating the River. These will most likely be flattened down/cut back from all the spring traffic by the time you go though. The island site where I stayed on North River L was nice, but no beach - she was ringed by boulders on one side and marshy on the other (north-west). She did have some nice shallow sandy areas though, but again I was there at high water and for the most part no exposed beaches. You will undoubtedly see lower water in your trip.
Both locations are nice and offer decent fishing for the same species (brookies and lakers). Water clarity is the same in both lakes, maybe a touch clearer in North River L and to be honest likely more sandy areas by campsites in the Allan/North Depot area (not to mention fun rapids/current to play in...).