I totally agree, fit and finish is hugely important for me when spending a lot of money.
I’m going to make a controversial point.
Personally, and I say this having owned one for a year or so, I don’t think the the Bianca is as well made as it could be. There’s some quite thin gauge steel, some very sharp edges (I sliced my finger pretty bad when cleaning it) and the steam/hot water tap handles weren’t drilled dead centre on mine so they kind of wobbled loose when opening.
However, it’s a feature packed machine so despite the above I’d say it’s still worth the price compared to others.
In terms of build quality and finish, the Linea Mini is in another league entirely, it’s not even close. Even the stainless portafilter (vs chromed brass) feels quality.
Obviously though this has zero impact on the coffee output and people regularly point out how expensive it is for what you get and I can’t disagree.
The Micra makes some compromises that would be a deal breaker for me. Plastic parts on the Portafilter and a tiny working space. For the difference in cost the Micra only seems to make sense if space is at a premium.
When you get closer to a decision, I’d recommend visiting a showroom to see machines in person if at all possible.