The Definitive Collection by Chuck Berry. I'm liking it so far, and I think his voice is smoother on the ear than Holly's. I like both, so it's all good. I got the Berry disc through the public library too.
AT, yep, it's sad that he died so young. I wonder what his style of music would have been if he made music in 1960s, 70s, and onwards. I hope that it wouldn't be too folk rock-ish, but maybe he'd go for Phil Spector type of production. I wouldn't be surprised if he went country later on in his life.
ETA: I like Holly more. I was going through several songs in the last 15 minutes, and it sounded the same. It had the distinctive guitar sound and intro and piano. I could differentiate Holly's songs more easily than I can with Berry's.