[Cherryville Chuck]

Fine Woodworking did a jointer test in the last year and the Grizz came out as best value if I remember right. The test was on all spiral heads I think too. I've had an 8" for over 20 years and I would have been unhappy with a 6" I think but very rarely have I ever had need for one that's wider. A longer bed would be nice though. Mine is 72". Go longer if you can afford it.
The parallelogram type is harder to adjust very finely but I don't see that as a big problem unless you do a lot of rabbeting with it. Then you need the fine adjustment. Otherwise you are just trying to flatten edges or faces and precision isn't critical regarding depth of cut.

 

[Cherryville Chuck]

Hi Bogdan and welcome. What's adequate for you is always dependent on what you need it to do for you. With jointers its how wide and how long that dictate the answer. I think in a discussion a few years ago we came up with a rough rule that you are limited to about double the length of your infeed for how long a piece is practical and still expect good results with a jointer so if the Cutech does that then it should probably serve you well.

Keep in mind too that with woodworking machines that old heavy iron is in most cases still serviceable too. Don't discount those. If I could find an old industrial drill press for a reasonable price I'd replace my Delta 16.5" in a heartbeat.