mo-rich - one of the founders, mo pinel, is supposed to be the albert einstien of bowling... he has many patented cores and is now being manufactured by brunswick... so (on some balls) you get activator and his dynamic cores, also you get very good customer service in terms of layout help...
circle - manufactured by storm... i think they are just recycling old storm cores with new covers.
dyno-thane have a heapload of balls to choose from.
Track - like to call themselves the leaders in bowling technology... although C300 has developed a whole NEW coverstock material (epoxy resin). but then again C300 manufactures Track so the technology will eventually be shared
c300 - is set to release 2 new Epoxy Resin bowling balls... these are supposed to hook 10 boards more than any ball in the bully line... lets wait and see. supposedly with epoxy resin, reaction characteristics depend on the cure time of the coverstock. and NOT by addatives.
lane1 - famous for the diamond core which offered a very unique roll which was very controllable.. but they have not used the true diamond core for a few years now (except in the xxxl, plastic 2 piece).. lane1 also manufactured by brunswick and some balls use activator coverstock
brunswick - Zones (heavy rolling) and infernos (activator coverstock) is all the rave in the states... basically every1 who is winning is using a brunswick ball.
storm - balls go long and finish strong.. which is maybe why they are so popular here in australia due to our majority dry lane conditions.
rotogrip - recently purchased by storm.. i would reccomend their sonic line to anybody! entry level and mid performance is where roto-grip shines... rotogrip was made famous by the SD-73, which if you have one NIB please sell it to me!
ebonite - old school, hasnt released anything that has caused much hype lateley, manufactured by c300... v2 series seems to shine above the rest
amf300 - have been coming out with some pretty decent balls, using the cuda cores with enhanced mass bias weights... very strong backend but amf holds prejudice with many people due to their past "lousy" releases.
hammer - nothing hits like a hammer as they say.. also manufactured by c300, owned by ebonite.
visionary - developed a new AMB core construction system that minimises the affect drilling has on the balls reaction characteristics... dont know wether this is something positive or negative? both sides have their arguements
legends/lanemasters - they use reactive resin throughout the whole balls construction, from cover to core... dont know wether this is something positive or negative.