I might be a little biased here, but I would recommend you to start playing on 4Retro, as we have put alot of effort into making the start for new players as enjoyable as possible.
You receive Level rewards every 5 levels from 5-90, containing not only all necessary equip to level up (with up to an temporary +20 weapon at Level 85), but also goodies that will permanently help you in the long run, such as upgrade items, a companion and an RNG Box that contains valuable items for you to sell.
And of course thats not all! By finishing all the dungeons from 19-79, you will be rewarded a total of 350 materials to craft Lv. 38 Gear (350 Mithril, 350 Oil-Soaked Leather, 350 Flawless Leather).
As soon as you reach Level 90, you have several ways of upgrading your character even further. Just recently, we have added daily quests, which will reward you with a permanent Lv. 36 Weapon if you finish all 4 of them every day for 2 weeks. We also have our custom farm map called "The Swamp", in which you can comfortably farm all necessary upgrade items, such as Tinctures, Masters Formula or Arcanes Reagents.
I could go on and on about what 4Retro has to offer, if you want a full on guide on all of our content, please check out this video:
If you want a less biased opinion from a player perspective, you can check out one of the many streams/videos created by our community:
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