Tauto: Builder will install,but I thought a home version would have less shit on it. The extra stuff on Pro would never be used by me.As for security a good virus protector will suffice,I think:)
Win 10 Home makes you MS's beta tester even more (not that using Pro doesn't, but those are really the cannon fodder, with even less control on all that shit running whenever it wants).
And since you asked when 8.1 will be killed,
Jan 2023, but you'll likely need to trick it if running on a recent generation CPU.
About SSDs, the write cycles shouldn't be that much of a problem with any current good one. For example my 250 Gb Samsung 860 EVO says 150 TB. That'd mean a bit over 41 GB written every day for 10 years. The 500 Gb one has 300 Tb, so over 82 GB / day for 10 years. You may not want to use it to record HD video constantly perhaps, but other than that...
The issue is with data recovery and failure warning. Quite easy to recover something accidentally (or not) deleted off a HDD if you realize it right away (or even later on a non-system partition), not so much on a SSD. And a chkdsk /f /v /r will likely let you know of a HDD's issues in ways that may be harder to notice so easily on a SSD. Also, when SSDs fail, they tend to fail for good, while a HDD tends to have first some bad sectors, data may be recovered even from there, give you warning that it's all going to go belly up and let you save at least most things first...
But little point in a SSD for plain data though, at least in my view, so would go for SSD for OS and games (possibly just more demanding games if you want to split) and still HDD for other stuff, thinking of both price and risk of complete data loss. Though, of course, if you are in the least concerned about the latter, backups are a must. Learned that the hard way over a decade ago and have only improved my backup routine since. Currently there are things I have in as many as 5 places (2 external, albeit one updated monthly and the other only when I'm particularly worried something might go belly up - a script makes 2 local backups of the important stuff daily), and everything bar the installed games in at least 2 (and that exception is just for the game files, I mean, saves are in the "stuff I can't just get again" category and therefore in 4-5 places).