Originally Posted by ahibbs7

First Post Here...

Started cycling a few months ago and have become addicted. I have Shimano Sora groupset and would eventually like to upgrade. Can someone give me a quick crash course in Shimano and SRAM groupsets? Maybe list "worst" to "best". Also, knowing all parts are important, what is the MOST important piece to the groupset if they are mixed and matched?

Thanks for the help in advance...