I'd say that a reliable indicator if whether a tool is trade quality is whether or not 110 volt versions are available - as far as I can ascertain Smart don"t do a 110 volt version - so not trade
Like you I've really only used trade tools, having had the original Fein Multimaster and an FMM250 before switching to a Makita DTM51 (cordless) and a Festool Vecturo 110 volt (actually in part on your recommendations). I've also used various of the firm's Makita and Bosch blue corded models in the past.
What I can say is that the original Fein and the cordless Makita models were/are really noisy, that a quick release (tool free) blade change is worth the extra money if youbenvisage a lot of use and that the more power you have, the better. The vibration in these tools can eventually kill them either by wrecking the switch gear or breaking internal wires (which happened to my FMM250 twice before I gave up on it - took 5 or 6 years, though). The other thing is that the Star blades being pushed by Bosch, Fein and now Festool, whilst very good (fast cutting) and stiff are expensive and those newer Star machines can't use the older style, cheaper blades, as stated above