Having too much time on my hands I have read this year all of the 11 books in Snow's 'Strangers and Brothers' series, and the 12 books in Powell's 'Dance to the Music of Time'. Here are thoughts on both series.
Powell's characters are more closely observed, yet as specimens. Yes they have altogether more plausible speech from which one could draw assumptions about their characters. Yet his observer Nicholas Jenkins remains somewhat at a distance. It is mentioned in passing that he marries, but his wife plays relatively little part in the story.
Compare with Snow. His characters are pretty much employed to speak as his hero Lewis Eliot (a thinly disguised Snow) speaks, often rather more portentously. But there is much more about his wives. The first marriage is near catastrophic because Sheila is mentally ill, and knowing this, Lewis marries her early in life. The second marriage, to Margaret, goes much better, though he nearly misses out. She, perhaps because Lewis's secret work makes him altogether too introverted, marries someone else and has a child by him. At the urging of friends he woos her and wins her back.
In my opinion, Lewis Eliot is a much stronger thread linking the series than is Nicolas Jenkins.
Snow's book deals with some big themes rather well. They include the rôle of science in government, and the the rôle of the law, and to a lesser extent religion, in society.
As someone else wrote on this site, there seems to be in each book someone on a self destructive course.
• George Passant inspires his younger contemporaries and incurs the suspicion of his contemporaries about his motives(not wholly unjustifiable)
• one of the March family incurs his father's wrath by giving up the law to study medicine
• a brilliant but depressive classicist essentially commits suicide by joining RAF Bomber Command
•several fellows at a Cambridge college go out on a limb to save the reputation of someone who may or may not be guilty of scientific fraud
• someone in charge of the British atom bomb project resigns because of possibly unwarranted moral concerns
• Lewis himself goes to some considerable trouble at risk to his health to save rather unworthy students from severe discipline
and so one.
FR Leavis in 1962 launched a hysterical rant (in my biased opinion) attacking Snow and all his works in the most intemperate terms. I think it was in large part a ludicrous over reaction to Snow's 'Two Cultures' talk, in which Snow savaged the wilful ignorance of science on the part of the literary establishment. In the short term it did Snow no harm at all. He continued to publish successful further books in the series until Last Things in 1970. His work was serialised on BBC Radio and Television. He got a peerage and served from 1964 to 1966 as parliamentary secretary to the Minister of Technology.
In the longer term, 'Dance to the Music of Time' remains in print, and the 'Strangers and Brothers' series does not. But you can get both on Kindle. While I enjoyed both, I was more engaged by 'Strangers and Brothers.