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tjm,
Almost every stat I get comes from bbref. It tends to load more quickly than most of the other sites, (less graphic intensive), and when I'm perusing from my work location, bbref is one of the few stat sites not blocked by our firewall.
The "splits" data is available for players for individual years as well as career. This is where I pull count info. I use Fangraphs occasionally, but find bbref just a better site for my needs.