I have removed my answers, because, it isn't written good.
I say, i stay on RS232 and RS232 & USB Adapter. It is not expensiv. And i didn't feel like for developing for new version with UART-USB onboard. I didn't like, if i am annoying in five years later, because new driver (from update) disable old UART IC. (See Profilic with old UART IC and FTDI and fake.-IC -> asshole !)