Does the 955 have all the am channels that 497 does?

Yes, in fact, it has more channels than the SR-497HPC.

The SR-497HPC will put out about 20 more watts, but it does not have a frequency counter or sideband like the SR-955HPC.

Here is an easy way to sum up the differences. If you want a simple, easy-to-use radio with a lot of power, the SR-497HPC is perfect. If you want a radio that talks and receive well and is decked out with every feature, the SR-955HPC is an excellent choice.