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The 'do whatever you want' responses aren't particularly useful since it's obvious people can do what they want.
If you're talking about ending the grinding and just play casually and earn most of the money from collectors, TH9 might be better so that you have a place to spend your elixir (xbow) and have more defenses. Even though TH10 will no longer have that 50% penalty on you, they'll probably skip you and find better targets who are currently farming and have more resources in their storages
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If you find TH8 to be a grind, then DO NOT upgrade to TH9. I have access to 3 accounts; my own, plus the 2 accounts my kids started then abandoned. We're mid TH9, early TH8, and almost maxed TH7. I mostly farm with the TH9 account, and war full time with the other 2. The near max TH 7 is easily the most fun to play; high TH 7 is in a real "sweet spot" for wars, since I can 3 star most TH 8's and any TH7 we come across. The TH 8 is a bit stronger, but is also ranked higher, and I'm always scrabbling for resources to try to make it a "real" TH 8.
If you want to try a different game experience, consider your base "complete" as it is now, and find a really active war clan to join. We're always looking for active players in your range. We're DOOP, leader RCWyatt, 44-3-1 war record (or maybe 45 wins now...it's hard to keep up).
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Maybe Im missing something but if you want to quit playing, why would you keep playing just to stop playing at a different point?
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Th9 would be a good idea. You have a lot more attacking options. Once you have xbows you can still make some progress from maxed mines and collectors and have a decent chance of keeping your loot long enough to do medium upgrades. It would be more fun at th9 and if your not farming the loot penalty is irrelevant and you would still be making some progress.