I'd be interested on your views on the difference between a mono album and the same album in stereo on vinyl also does the vinyl weight have any bearing on sound quality
Vinyl: Please see my thread 'Standard vinyl vs Audiophile/Weighted vinyl - What's the difference?' and follow the link there for a very good discussion on the subject.
Mono v Stereo: https://www.diffen.com/difference/Mono_vs_Stereo
The only critisism I have of the above web article is at the end, the author says 'Mono is not used in 8-track tape and audio CDs.' Dunno about 8-track, but I'm sure there are audio CDs in mono!
Forgot to say that despite how amazing your vinyl, it'll only sound as good as your stereo is.
Also, to add to the complexity of things, I read today there's a new HD vinyl to be marketed:
https://inews.co.uk/news/hd-vinyl-coming-in-2019-is-music-to-audiophiles-ears/
I remember reading as well as higher quality sound, the technology also means CHEAPER PRODUCTION COSTS! - but, I'll bet, higher prices to the punters.
I would always go for mono pre-1968 and stereo 1968 and beyond. By 1968 stereo mixes were given more attention and regarded as more than an afterthought. Earlier stereo mixes were often ham-fisted, with instruments/vocals separated into channels and the 'novelty' element of stereo emphasised. There are several '67/'68 UK psych LPs where the stereo and mono mixes are significantly different, but by 1969, mono mixes tended to just be 'fold-downs' of the stereo mix.
Notably different mono/stereo mixes feature of Blossom Toes first, Piper, Pepper, Tomorrow, SF Sorrow, Family Doll's House and probably others that escape me at the moment.
I agree PP though there are exceptions like the Tomorrow album from 68. I think the mono version of that sounds much better than the stereo. Though I guess that was reecorded in 67 and the stereo version was ballsed up anyway.
I have quite a few 45s on Fontana and Philips which were released as mono mixes as late as 1972. I wonder if the recordings themselves were several years older, I have long suspected it.