So many suggestions, many conflicting, but all possibly the best choice in hindsight depending on one's personal situation and how life and the markets work out.
It all makes me glad that for DW and I, the decision has been quite inconsequential. I started SS at 62 with the intention of paying it all back before 70 and starting again if I lived that long. Then the law changed and the pay-it-back option was eliminated and I decided to stand pat. I'm glad I did as investment returns on that money were fabulous those years! And that decision gave my DW some protection as she was impacted by WEP/GPO.
DW started her tiny, WEP reduced SS at 65 to partially pay for her Medicare. Now, with the introduction of the SS Fairness Act, DW will receive approximately two-thirds of my current benefit beginning in April. Sweet but unexpected.
Yet, I can envision scenarios where other SS decisions would have worked out OK, maybe some better, maybe some worse. But, none different enough to have really mattered. We don't need more to spend now, then or ever. We don't need longevity insurance. The predicted "haircut" coming up in a few years won't really matter. I guess looking back and feeling satisfied that everything worked out fine is less stressful than looking ahead and wondering what decisions to make, especially if you're cutting it somewhat close.
OP, it doesn't sound like you can make a big mistake with any of the prudent decisions open to you. Don't stress over it. Enjoy life!