It depends what you mean by "best."

I use a TradingView algorithm, which is directionally accurate, but requires a subscription (I think).

The FRED (St. Louis Fed) site tracks US M2, although I prefer global M2 for global assets, like bitcoin.

Many people/sites regularly post updated global M2 charts, including:

- Michael Howell (Cross Border Capital)... the most nuanced and complete

- Darius Dale

- Hedgeye

- BM Pro

- nostr:nprofile1qy2hwumn8ghj7mn0wd68ytndv9kxjm3wdahxcqg5waehxw309ahx7um5wfekzarkvyhxuet5qqsw4v882mfjhq9u63j08kzyhqzqxqc8tgf740p4nxnk9jdv02u37ncdhu7e3

- Real Vision

- nostr:nprofile1qy2hwumn8ghj7etyv4hzumn0wd68ytnvv9hxgq2hwaehxw309anxjmr5v4ezumn0wd68ytnhd9hx2tmwwp6kyvtnx4uhzdnhv9j8wuncv3jngmrgveen2dn8dcmrg6rh0f6ksmnxvym8ywtddg6rwdnjx4eng6rtw4h85em6w9e8xdn3xaaqqgxy3dwva4dd5axmq7xldvq055luzyuawwlsa5tduvja2g3qyywm65eft0d8

- nostr:nprofile1qqsphh4hcsk9trquc2rd0drwge9vh75rmaa43xru4ha74nyrld9emyg4vj6zg

- and many others...

Hope this helps.