My extremely biased Army opinion:
Airforce: Like hotels? Go with them
Navy: Like water, and, well, water? Go with them
Army: Like land? Roughin‘ it? Camping? Hiking? Weapons and big guns? Go with us
Id say if you are looking for adventure, you can find it anywhere in the forces... ‘cept for maybe Log.
As for Pilot.. you wouldnt believe how many RMC cadets start out trying to become pilots.. only to have their hopes and dreams dashed as they then try and get AirNav, and then (normally due to the eyes) try for ATC... Ive seen it happen to at least 20 people that I go to school with, and thats before flight training even starts.
The med is very stringent, and as previously said, so is training. Just showing up is not good enough.. **** even a lot of effort sometimes isnt... Its a really tough trade. And dont even think you will get to fly the CF-18. If you do, consider it a bonus, not an expectation, otherwise you‘ll be severely disappointed.
As for joining, as prev said... Air Navigator and Pilot are officer positions, and the CF requires degrees. You can do ROTP (RMC or POSSIBLY a civi university), or DEO, if you go and get your degree and then join afterwards.