From lvl 1 to 35 is almost 100% quests.
From lvl 36 to 45 you must grind a lot unless you are premium.
From lvl 46 to 49 almost 100% quests.
From lvl 50 to 53 grind fest if you arnt premium.
From lvl 54 to 60 almost 100% quests.
From lvl 60 to 65 a lot of grind
At lvl 66 real easy, only 1 quest but give almost 100% (and more than 100% if you make it during a xp event).
From lvl 67 to 71 (100%) hellish grind.
Imo it's better than silkroad, i like the atmosphere, enviroment in requiem. In silkroad u get only 2% per quest, requiem it's kinda based on quest (a bot it's kinda useless), also in requiem hp/mp potions are not necessary to use as many in sro, at high lvls there a lot of party's it's really good.
Conclusion: requiem>sro (lvling rate).