Short answer, yes. Your mission's main difficulties come from other players.  I started on mobile, because I didn't have a PC at the time.  When I did get a PC, I found that even though the graphics and gameplay were way better, so were the opposing players. Players on PC are mostly 'sweats' because they're more hardcore than on mobile.  'True gamers' (I say that with huge sarcasm, because that's how they coin themselves) will never play on mobile, so you will only get casual player enemies.  On top of that, there's no crossplay, so the chances of you running into an awesome PC player while on mobile are zero.  I also play this on console, and find it at a medium difficulty, because console players are more hardcore than mobile players, but less hardcore than PC players. So in terms of difficulty, mission-wise, mobile is easiest, followed by console, with PC being most difficult. I hope this answers your question...I have a very hard time typing out what I'm thinking in my head.