Honestly the only ones id really call functional are 2fdck and k3t. Semi functional would be dck, mxipr, ephinidine, mxp. non-functional would be all the pcp/pce analogues. Im forgetting a bunch of others lol. As for fun it just depends what youre going for. Id rather k3t than 2f, tho ive mixed 2f with other more speedy ones to chill them out. Good Dck is my go to for sure. I love 3-meo-pcp but its truly a demon and not to be fucked with. Opce is amazing for a wild psychedelic ride. Def preplan the vibe for that one. I really like dmxe. lots of euphoria for me and doesnt last heaps long so is good for those times when you dont really need your fun lasting for hours and hours. Had really good times with 3-ho-pcp but again all the pcp/pce analogues are fucking demons and the line between fun and manic episode can be very thin. Only play with if you are capable of not redosing. I havent tried all the new pcp analogues but i also havent heard any good reports really. Saw that hxe made a debut but also heard it was trash. Too bad on that, it was really gassed up to be a star.