The surfboards are a safe bet. They tolerate noise better than the Toshiba and usually perform very well. One of the biggest problems with cable modem performance can be funneled in to two categories:
1. Cable plant problems. Motorola holds up where others fail, unless the problem is beyond its ability to recover.
2. Config File. The Config will govern the performance and how well the modem adjusts to power fluctuations, noise, routing, packet management, speed caps, etc. The CF is pushed to the modem by the cable operator when it boots up. Cable companies often push new CF's to the modems without ever interrupting service or with the user knowing anything about it. It is usually a seamless process. However, if the new Config File is buggy, like any patch ur upgrade can be at times, any modem can go down the tubes.
I have a Toshiba and a Moto 4200 and they both work fine, but if I had to do it again they would both be Motorola.