Before I write on what I quoted you on, I would first like to say that I find the concept of taking substandard models on trips, just because you are afraid of your "good" ones get damaged is not really a valid concern, unless we are talking truly prize winning stuff here. If damage is truly a problem, then I would suggest that you might not be packing your models correctly?
Now, as far as your quote goes. I find it strange that you used the Peacekeeper of all models to illustrate your point. To answer your questions - yes I absolutely believe that a 30+ piece plastic peacekeeper will be a better model than the metal one, and yes I believe that it will look better as well.
--Large models are always better done in plastic, just from a weight consideration
--Robots or anything that's composed mostly of mechanical looking parts are probably the single best types of models to be cast from plastic. The sharp edges and mechanical joints are far more effectively created with a digital CAD program and are best realized in plastic
--The original metal Peacekeeper is probably the single worst looking construct that Wyrd has created. No offense to the original artist - the model was made in Wyrd's early days and they were basically making do with the resources they had, but the model shows it's age drastically. It's overall appearance is quite goofy looking, and the sculptor did a really poor job of hiding the bits and materials he used to create the master. When I can look at a model, and instantly know what size of brass rods he used to create the Peacekeeper's spindly arms...this is a piece that is not held to the same level of professionalism that the modern models are.
--The new plastic constructs in the Hoffman box are massive improvements of the original metals - despite their overall "look" being basically the same. There is every reason to suspect that the Peacekeeper will be improved in the same degree.
So anyhow like I said - I get that you weren't trying to start up a big discussion about the Peacekeeper specifically. I just think that using it as your reference here kind of undermines the point you are trying to make, since the new plastic will be such an obviously superior model that it's easily worth the wait