My locos are predominantly Trix HO in Swiss SBB.
I feel the metal body is worth the extra over the plastic moulded body from other manufacturers, that said, I also have Roco SBB which fall into this category and value for money, the Roco quality is excellent.
I have , however had a real "duff " purchase in the past. a lovely Eb3/5 SBB Steamer from Trix, all metal, ran superbly, but the cab was full of motor ,,, and disguised with smoke grey plastic curtains !
This was a compromise too far, for me personally and the model was sold.
So I chose carefully, even Trix drop "clangers "
Finally, my latest recruit, is an old timer ( vintage 1988) from the "original" Rivarossi stable a small Diesel switcher, a fabulous little model, that has needed some modification for DCC running. The design of this model is incredible for its age.. Beuhler motor with flywheel fit, Nem coupling pockets, sprung buffers, the body /chassis is click fit...( yes some tabs broken with age), The body is plastic , but very highly detailed, and only 2 screws in the whole model !
Delighted with it, even though work is needed to get it to 100% DCC reliability.
Thats my small Swiss fleet
Cheers
Steve B