The highest end will probably be from Bezzera which we can only get a few pieces each month and start in April.
For exceptional quality, can consider Bezzera's Strega, even professional roasters are using them.
After over a hundred years of production, this is still the only lever semi-professional model Bezzera makes and all they need.
Bezzera Strega Espresso Machine - FINECOFFEECOMPANY Singapore Malaysia
It's basically a commercial lever machine, with very strong thermal stability coming from the architecture of how heating inducts.
Instead of using your hand to control, it's assisted by spring so it's a little more "automatic" and more consistent.
Extraction is done from a high pressure then gradually lowers.
This extraction with varying pressure creates definition and promotes clarity in the coffee's profile.
If you want the latest model with most of Bezzera's newer proprietary system and features, then it's BZ13.
Bezzera BZ13 Espresso Machine - Fine Coffee Company Singapore,Malaysia
Compare to the rest.
This is faster to start and repeat shots.
Strongest thermal stability.
Temperature control.
Auto dosage, so users no need to measure their shots.
BZ13 is a little easier to use, but all of them are not hard to pick up anyway,
Temperature is crucial as at different temperature, coffee will blossom its flavours differently.
If it's too hot, it overburns and disintegrates most of the delicate aroma.
All are using copper boilers, not brass which releases lead.