I remember one such comment from Erik a long time ago when he had suggested somebody, especially a newbie to stay away from C8051F3xx. Thank you Erik.
The reason i recommend staying away from the SILabs deviates (F3x-up) is that the I/O structure is totally different from all other '51 derivatives and thus after learning a SILabs deviate you have to learn everything again if you choose another '51 for your next project. i happily use lots and lots of SILabs derivatives (f0x-f2x)