Thanks for the reply,
I think that there is a misunderstanding about quality.

There are 3 different areas about the quality of a product:

1. Quality of parts used for the product.
2. Quality of design, meaning solutions selected to implement the product
and required calculations to fulfill specifications.
3. Fabrication quality and "repeatability" of produced items
(how much identical to what was designed are produced items,
and how much identical are between them).

Looking at videos, pictures etc, can give an indication about 1 and 2A, but not to 2B and 3.
So this is a reason I have this conversation with you.
To hear your opinion about these matters.
Which in previous posts was not clear.

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So seeing all offered printers within some budget (that I can buy without problem in Greece),
I think that best solution is to by a smaller (and cheaper) one,
to see in action all these 3D printing issues I am reading or viewing in youtube, fora etc.
And then design one it will fit to my requirement, using the small one to print the plastic parts needed.

I know that this solution will become more expensive than buying at once a big printer,
but it is less "dangerous" to throw a lot of money.

So I see two "candidates" (both from Tronxy) the XY-2 Pro and the X5SA Pro.
It seems that XY-2 Pro is a more "safe" product (and with less money).
But X5SA Pro is of CoreXY type, that I think it's better for a bigger machine I am planning to construct.
Also it is using sliders for X and Y axes, that I think they are more precise than V slot rollers.
I think it is better to buy this type to see in action problems and possible solutions.

I am open to any suggestion or other proposal, based on the above consideration ...