I started with ultimaker bronze. It wasn't great in my opinion, it made the print lines and grooves really obvious and wasn't great at overhangs.
I've just finished up a spool of blue which I would recommend, I've got some great finishes with this colour.
Starting on a yellow now which looks very promising, I also have a white to try once I've finished this one.
I'll definitely give that silver grey a go, it looks gorgeous! thanks for sharing!