PandabRO is a new server with active GM's and a ton of features. I find this server unique because it is Classic (Pre-Trans) and still provides unique quality of life luxuries such as an infinite flywing, warping to friends, and other gear/potions/exp+ starting items. The donation system allows you to keep these benefits at a reasonable cost, as well as allowing you to achieve them through in-game events. The server is also updated often.

heRO isn't just a classic ro server, its an entirely different game. Their GM Staff (which includes a test&dev team) is ran by gaming hobbyists that are actually real life professionals. Custom edits include player hairstyles, adjusted renewal content (Dimensional Gorge, etc), game mechanics (no gutterlines), item-drop-on-chance gears, SP item accessibility, boosted XP Monster of the Moment, and so much more. They don't have to use Hack Shield to prevent cheating because GMing is that legit.