For your Information, Funk has recently released its latest RADIUS server running on the both Windows and Solaris platform.
I have tested the solaris version and it supports Microsoft PEAP (which requires MS-CHAP-V2 for inner-authentication). It worked fine with Microsoft XP Service Pack 1 PEAP and Funk's client software 'Odyssey Client'.
I don't think nobody can say which protocol is which. It is only the decision of the network administrators or wlan security policy admin to use PEAP or TTLS.
But if I am, I will use TTLS with Funk. Easier but expensive.