Maybe an ultra-light plane, not helicopter, with huge wings could gain some altitude there.
Under certain circumstances, I'd agree with you. Fixed wing aircraft are much easier to fly and have a much better performance envelope than rotary.
However, that isn't going to work in this case.
For a wing to generate lift, air has to be moving over the wings, or the wings need to be moving through the air.
"Obviously Horus, I'm fully aware how flight works"
Of course you are. I'm not questioning your knowledge of flight, more the location and situation flight is bring attempted.
An aircraft needs to hit a certain speed for the the air to move sufficiently fast enough to generate lift. There are ways of cheating this a little bit, but the fact is to attain flight, the plane is going to need to be moving already.
Where? Without a sufficient length, flat area (like a runway or similar) on the martian surface, the plane isn't going to go fast enough and thus won't fly. Or some kind of catapult similar to the ones on aircraft carriers. The other problem is that if the take off fails, or after it lands to recharge the batteries, then it might not be able to fly again, making it a one try, one shot deal.
Where as a helicopter can make the wings move faster just by throttling up and making the rotors turn quicker and because of its inherent VTOL ability, can lift and land and lift again anywhere it can set its feet down and not hit anything with the rotors.