1 for long game
2 for blitz game
were not compilers so cant realy answere why some engines are better for blitz than longer games , perhaps as for books some way of optamising settings makes a difference .
all we do know is that you realy do need to test at the same time control you intend to play real games to get best engine for that time frame, jazzes last two comiles have 32 bit engines but we cant test them for you as we use 64 bit pc's
try new one vrs one that beat t ghost