Which PCB Fabrication / Manufacturer do you use?

My go-to on regular basis is Aisler.
A few reasons for that:
I need pcbs for professional use, since Iḿ based in the EU its alot more convenient for taxes and Bookkeeping to have a EU based manufacturer (they also have a seat in USA btw.)
I mostly need just 3 pcbs (one to make one to break and one for the records), but i need them consistently in quality and without any import hassle.
I've been an early adopter since I happen to know the founders personally, pricing has become much more competitive in the last few years.
For my typical use cases I'd pay the same at Aisler than I would at Pcbway/jlcpcb and alike) but without shipping and import hassle/taxes.
(I mostly use 2-4layer ENIG)

I've tried Pcbway, jlc, and a few other chineses ones, as well as eurocircuits and mutliCB in europe, and oshpark. They were mostly Fine in quality.
But I had shipping troubles a few times, invoicing is incompliant at a few places, so for convenience and reliabilty I circle back to Aisler again and again.

Only exceptions are if a client requests a specific color or thickness -> that leaves me only the choice of another vendor, in the past mostly jlcpcb, but I avoid them now because of data breach claims on twitter.
I also don't send any IP critical Designs out of the EU, for obvious reasons. In such cases I simply price in any additional costs.

My go-to on regular basis is Aisler.
A few reasons for that:
I need pcbs for professional use, since Iḿ based in the EU its alot more convenient for taxes and Bookkeeping to have a EU based manufacturer (they also have a seat in USA btw.)
I mostly need just 3 pcbs (one to make one to break and one for the records), but i need them consistently in quality and without any import hassle.
I've been an early adopter since I happen to know the founders personally, pricing has become much more competitive in the last few years.
For my typical use cases I'd pay the same at Aisler than I would at Pcbway/jlcpcb and alike) but without shipping and import hassle/taxes.
(I mostly use 2-4layer ENIG)

I've tried Pcbway, jlc, and a few other chineses ones, as well as eurocircuits and mutliCB in europe, and oshpark. They were mostly Fine in quality.
But I had shipping troubles a few times, invoicing is incompliant at a few places, so for convenience and reliabilty I circle back to Aisler again and again.

Only exceptions are if a client requests a specific color or thickness -> that leaves me only the choice of another vendor, in the past mostly jlcpcb, but I avoid them now because of data breach claims on twitter.
I also don't send any IP critical Designs out of the EU, for obvious reasons. In such cases I simply price in any additional costs.

mayermakes said:

mostly jlcpcb, but I avoid them now because of data breach claims on twitter

That's wild, I only saw the claim from february? 

Oh yes I forgot about the option for just 3 boards with Aisler. Personally I quite like 4 (not seen but wish it were possible) or 5 (more common)... as I tend to make more mistakes

I had different versions of the same prototype fabricated some months back by Aisler and by OSHPark. Very similar in quality... hopefully my camera does these pcbs justice.

I uploaded 4-layer GaN PCB gerbers to Aisler. They charge 23 € for 3 boards, including shipping to Belgium. That's competitive.