what is this 'points' you're talking about?
FG grinding is for upped cards -> electrum
T50 is good for score if you're playing speed/rush with some sort of EM enabler
L5/AI5/HB is ass because of their 200 HP and widely varied decklist
some says L3/Elder is good for score too but i notice a minute amount of increase if you dont EM them so its the same with T50 but worse because T50 has the higher potential for rares and thus more electrum