Well there's this list:
https://docs.google.com/spreadsheet/ccc?key=0AhR02IDNb7_MdEhfVjk3MkRHVzhKdjU1YzdBQkZZRlE#gid=0
And the BlHeli distribution includes a file that lists more details about which BLheli features are supported on which ESC's.
I've switched over to BLheli on all of my non KISS ESC's - but that doesn't mean I don't like SimonK. SimonK actually has more options and features than most people realize (most people don't seem to know what SimonK also has a beep function like BL/KISS where the ESC's start making noise if they don't get a signal after a few minutes, and some don't even realize simonk has comp_pwm ) - but they're not as easy for the end user to change unless they use RapidFlash which doesn't support the flashing hardware I happen to use. That said BL does have more settings exposed to the user - but most of them really never need to be modified for most uses.
What I like most about BL is that it seems to be undergoing more active development. SimonK certainly isn't stuck or not progressing...but does seem to be playing catch up at this point. (I know that the code for SimonK now support automatic oneshot detection like BL - but I'm not sure if there's an official release version with that incorporated yet.)
It does seem to me that BL's damped light works better than SimonK's comp_pwm but it can vary wildly from ESC to ESC which makes this a somewhat nonsensical question as the answer varies depending on the ESC.
If you've got the setup and ability to flash ESC's I'd say try both - it's not that hard and is pretty much the only way to find out which is better for your particular application/hardware.