1. If it's 255/70, Snipers with the true sight on will pwn at a different level than 99/70, LKs can differ from spiral pierce to head crush, knowing that the damage is more decent than the head crush in 99/70, Clowns get to spam vulcan arrow with the right timing dealing heavy damage, Assasin Cross will pwn wizards with breaker, as the stats 195/190 ASPD and 150 dex reduces delay by a big deal, professors loves nuking with double cast on, paladin can live long while devotion-ing a party member ( even longer with taos), Whitesmiths get to deal 13k+ damage ( highest I scored, without use of MVP cards) to emp and mvps with the right cards, Creators deals high damage regardless of enemy's vit due to massive int, HWs once again go nuking and occasionally magic crasher-ing GTB users, HPs get to be a massive wall of meat (or pixels) with it's high heal, Stalkers get to run around with Sacrifice and 255 vit, massacring loads. Star gladiators can use union and kick like hell piercing defense and die, Soul Linkers go esma if possible, or get a twin and god mode everyone with kaizel, GS dies, Champions asura tags random people as they don't have cast time.
2. go lowrate, I myself am a high rate person, but going lowrate will fit your style better. I am considering to move to low rate server as I also enjoyed partying with people, but I must say that partying with people for xp/items in a lvl 255 server is possible if the server has a custom dungeons, and those third jobs are in balanced, if you go on a warlock, you'll never use high wizard skills again because of warlock's magic power, same goes for the rest of the job.
I must say that if the server your about to choose has +5 allstats kind of cards, IMO I will not play that server, any server with instant cast is BS IMO, there are different tastes in different people, I am just trying my best to answer.
oh, and I never seem to find the right server till now, might as well try the low rate server you posted +_+
