NovaRO in my opnion is the best server out there to form a guild with friends and play endgame content, with it's awesome new instances made by the staff with good balance and high rewards. In therms of early game farming it's just like any other server... boring farm. That's until you reach endgame, when you can form groups (specially with your guild) and farm endgame repeatable instances where you get better every time you clear it and make decent amounts of zeny.