This is a Quote from PCMag.
The SS2623 and its very similar competitor, the SMC Barricade 7004AWBR, are the most flexible and easily configurable wireless gateways we tested; thus we awarded both our Editors' Choice in the home wireless gateway category. The SS2623 includes two antennas for improved coverage range. It also offers a printer port, a modem backup port, time-of-day and station-by-station control features, and a worthwhile logging feature (so you can see just how late the kids are staying online). The host of useful features, combined with a reasonable price, makes either of these wireless products a sound choice for the home network.
http://www.pcmag.com/article/0,2997,s=1610&a=21265,00.asp
I would not be surprise if actually they are the same OEM.
SMC has more firware updates.
As I keep saying for long time, No real differences between the Entry level stuff, it is your call.