For me, it's the 3102. Yes, it seems some people have trouble with it, but I've found them to be very reliable and offer a lot of features, many of which will never be used by most users. The bonus is that you also get the FXS port, which if programmed as a 3CX extension, will fall-back to the PSTN line in a power outage. But, that's just me, I'm a bit biased towards them. I'm sure that other have opinions just as valid.