I own 3 Anglos: a Jeffries 38 with metal ends, a Dipper 30 with wooden ends, and a Lachenal 20 with wooden ends.
There is no doubt that the Lachenal is a Ford between two Bentleys in this line up, but there is nothing wrong with a Ford. it is still a lovely instrument to play and I play it as often as the other two. Mine is C/G, bone buttons, 5 fold bellows, wooden ends (with ore elaborate fretwork than the one shown) and steel reeds.
I am aware of two different designs of fretwork and the one shown in the photo is the more basic of the two and this may be reflected in other aspects of the instrument. I have played at least two with those ends: a G/D and D/A. The G/D was the nicest 20 button I've played - nicer than my own - and the D/A was pretty awful.
When I chose my 20 button, I tried out 5 or possibly 6 on the same day and they were noticeably different. I quickly knew which one I preferred.
The main difference, apart from condition (valves, setting of reeds, condition of bellows) is that the G/D I played had steel reeds and the D/A only had brass reeds.
The clickiness is part of the charm of a vintage and budget instrument. Seriously, you'll get used to it and forget it once you enjoy playing the little thing. There is a joy in squeezing happy music out of something that was made to be "cheap and cheerful" over a hundred years ago.
I think the answer is therefore, try before you buy, if you can. Failing that, £100 or so should get you some tuning and adjustment to bring the instrument up to scratch. There plenty of 20s around and as most people appear to go for 30 or more buttons, you can still pick them up for £250 to £500.
There is no doubt that a 30 button is more versatile, especially if you want to play chordal accompaniments, but there is a hell of a lot you can do on a 20. If you buy a C/G, you can do quite elaborate accompaniments across the rows in G. The 20 button layout encourages you to find your way around the instrument more thoughfully instead of relying on the extra notes of a 30. t makes you a better player.
I have played various "el cheapo" modern boxes including Hohner, Scarlatti, etc. Every one of them I have played has been horribly unmusical. Even now, with 10-15 years of experience, I would struggle to get nice music out of some of them. Old good quality is better than new cheap and shiny.
The received wisdom for a first budget modern Anglo is the Rochelle. That's how I started. 30 buttons, C/G. A workmanlike box, not beautiful, but it doesn't fight you and you can play it at proper dance speed.