Zurich to Milano - William Tell, or EC?

I will be traveling between Zurich and Milan in late February and would like to make the most out of this scenic ride. Of course, the easy path is to take an EC train between Zurich and Milano. However, I also see that panoramic IR trains run from Zurich to Bellinzona (part of the William Tell Express, I assume?), where I would then have to connect to an EC train for the remainder of the trip to Milano.

It appears to be CONSIDERABLY more expensive to do the panoramic train w/change than simply to do an EC train Zurich-Milan. But, is the panoramic coach worth the added cost and stop?

Thanks. I'm aware of the boat portion, which I don't plan to take. Every book I've read and person I've engaged with while planning says the boat portion is forgettable.

The real question is whether or not to take the panoramic IR train v. the EC train, and whether or not I miss any great sights by not stopping anywhere along the way (or, alternatively, if I see plenty of the region to get a sense of it from the EC train and am better off using the remainder of my day elsewhere, i.e., Milan).

I see. Well, the IR train takes the exact same route as the EC train. The only difference between both trains is that the IR makes a few extra stops and offers the opportunity to book a seat in the panoramic coach (those might be available in first class only). So, for the trip itself and the view from the train, you might as well take the EC.

It's subjective, but for what it's worth: I really enjoyed the boat trip on Lake Lucerne. I made that trip in Spring though. I don't know what it's like in February.

Another excursion along the way is to get off the train in Arth-Goldau and take the cog wheel train up the Rigi for a great view. You can do that using an IR, EC or any other train that stops in Arth-Goldau.

In any case, enjoy the ride!