[CentOS] HylaFax and Com Ports

I need to setup HylaFax which leads to my first question, anyone
got an opinion on whether or not to use HylaFax or HylaFax+?

Also, I have to setup a Digi serial port server for an external fax modem.

Any reco's on a robust unit that won't need to be reset often?

Thanks!
jlc