I think the older spike stuff is from a different manufacturer than the newer stuff and I also believe the kettles are made by a different company than the fermenters.. not sure about SS but the same might be true. you really have to compare the two actual products to get a fair assessment not just brand names.
the older spike conicals for example from say 4 years ago, were made in the states by toledo metal spinning... new ones are made in china and have the finish work done inhouse by spike as well as different components like the lids and clasps made by different suppliers if im not mistaken.
I have an ss brewmaster conical myself and I actually feel its one of the cheapest conicals out of my four with the best being my stout 12.5g the thickness of the stainless on my SS conical is MUCH thinner than even my genric no name chinese conicals. build quality is good as far as workmanship and fit and finish but the non sanitary weldless port and threaded ports on the valves is a step backwards compared to my others which cost less. the brushed surface of the SS is also a bit harder to clean than the polished surface of 2 of my others including the stout which practically wipes clean with a sponge.
just my 2 cents from my experience based on what I have.