Clearaudio Maestro vs Ortofon Cadenza cartridge?

I have the Clearaudio Maestro on a Clearaudio Concept TT. It’s good, and I’ve been told, that I have to pay a lot more for a better cartridge.

No you don't. 
You can find much better MM cartridges than Clear Audio for lower price!

Do you know that Clear Audio cartridge motor is actually made by Audio-Technica in Japan? 

If you want LOMC check for Shelter, Dynavector, Audio-Technica. 
  

No I don't? 
What better MM cartridge than Clearaudio's Maestro for €1.000 do you suggest? You only mention LOMC. But thank you for your advice.

I will leave the MM advice to Chak, but as he mentioned, at around $1000US, you ought to consider the AT ART9Xa or 9Xi, as examples of good MC types. I own the ART7, which is father of the low output version of the newer 9X models. (Can’t recall whether that’s the Xi or the Xa). It’s a fantastic cartridge. Maybe the absolute best bang for the buck among LOMC types currently available.

Cool. ART9 is highly recommended for my phono amp, but people also tells, that the alignment for the ART9 is very difficult compared to many others MCs.

Thank you Lewm!

"Alignment" has to do first with the tonearm, not the cartridge. VTA and azimuth are a function of stylus shape, however. There is nothing odd about the styli on the ART9X cartridges, so far as I know. The ART7 got no special attention from me in terms of VTA or azimuth. Tonearm is parallel to the LP surface. If your phono stage has enough gain, I recommend the low output version of the new ART9X pairing. (Sorry I just cannot recall whether that is the Xi or the Xa.) I bought the ART7 over the original ART9 a few years ago, because of my own bias. The ART7 uses an amorphous core coil and has a very low output, 0.12mV. I think the low output version of the new 9X pair (which seems to be the replacement for the ART7) has a bit more output, would be easier to implement. The ART7 was a bit "clinical" sounding at first, very detailed but not very warm, or not as warm as real music. However, within about 20-30 hours it has become a real gem. I am using it on a Kenwood L07D, the OEM tonearm with an aftermarket carbon fiber headshell, into a 3160 J&R Phonolinepreamp, in balanced mode (which helps with gain and is dead quiet). Recognize that it is high in compliance compared to the typical LOMC, which is a plus. Anyway, don’t be put off the AT cartridges by fear of alignment difficulties. (Sounds like something a dealer would say, if he wanted to sell you something else.)