Might be a bit late but hers my experience in cutting metal, either tray or trunking.
The best saw to cut metal is a ....metal circular saw, mainly for the guards then for the rotation speed. Using a regular wood cutting saw will throw all the waste literally in your face. Been there, done that and its not the best experience.
Now, if you are a dewalt person, like I am, you're stuck with their 373, decade old, brushed motor metal saw, which is antic but still better than a wood saw. For some reason, dewalt still didn't come up with a brushless motor saw.
But then you have Makita, Milwaukee and even Hilti I think, which they have the latest generation brushless motor metal saws.
Personally I use a dewalt jigsaw with a metal blade, for a big big majority of the cuts. Adaptable speed and way cheaper blades compared with saws. The only problem was with the compartment dividers on the trunking, but what the jigsaw blade cannot reach, I finish it with either a hacksaw or even a pair of tinsnips.
Hope it helps...