Crypto for me, for the main reason he has to be passive whilst manouvering his Tactical Surveillance Drone & Ultimate Drone EMP & I've often found even when using the best hiding places when using his Tactical or Ultimate without cover he's a sitting duck particularly for Bloodhound & Seer players to track him.And for use as a tracking player both Bloodhound & Seer are just better characters for that job & the fact his drone is just so loud it just makes it too obvious a Crypto player nearby. An option maybe to make his drone a lot quieter another option for Crypto to have is whilst in passive mode whilst using his Drone is to have a Wraith like warning that there are enemies in sight.
But ultimately as a character Crypto is what I would describe as a Marathon Runner (ie a lot more effective in long matches when there are 5 or less squads left) rather than a 100m sprinter (landing in hotspots with loads of squads when there just isn't time to play passive on his Tactical etc)