you should play HOTS, at least when you lose (mainly due to trolls/afks ect whenever I lose) you dont lose NEARLY as much progress as you do in league.
league wins: 3-4 wins = about 30-40 lp
league loss: 1 lost game= 25 lp GONE
(and thats when I was going on a ten win streak and it never improved)
heros win: 200-300 points (which advances you roughly 1-2 ranks per win, rank 1 being the highest and rank 50 being the lowest)
heros lose: 100-150 points lost which rarely demotes you unless you lose multiple games in a row (which if you are bad and truly belong in a certain tier itll take 2-3 loses per win to get you stuck into where you belong)
however if you can win 2 games and lose one and 2 games and lose one (etc.)
you will actually climb, if you win at least 50% or more of your games in hots YOULL ACTUALLY CLIMB (because statistically if you are winning 51% of games then you should be climbing, 50% being where you go 1w1L and dont climb or get demoted.)
oh and in hots deaths dont matter as much* as with league (*they still matter but you can come back easier)
oh and no items means no worrying about farm
oh and you can actually earn gold for new heros pretty easily by farming mastery level 5/9
oh and not to mention you get 2000 gold at I think four level milestones
OH AND they give you a free 7day stimpack at level 10 granting double exp and gold for 7 WHOLE DAYS
not to mention daily quests that reward 200-800 gold most of which are just "Play X amount of games" or "play X games as X type of hero"
oh and their ranked system? you have to have level 5 mastery on a champion before its unlocked in ranked (owned or not doesnt matter)
which means people cant "first timeX" in ranked
OH AND ranked requires 14 level 5's available from owned or free week heros. meaning if you get really good at somebody during free week but dont own him? you can still play ranked with him if you have 13 other level fives.
oh and unlike riot, blizzard didnt have any bans AT ALL, but blizz listened and ADDED BANS to their game scaling with the amount of heros there are (4 bans per game 2 per team)
oh and if somebody leaves? you get a "bot" of them that plays like a hard mode AI bot which can follow you around or do its own thing