I use both.
Last week I updated my logins using both Safari and Keychain as I was doing the same with LastPass.
I found for me that Keychain/Safari was much smoother when working in that environment and the Touch ID on the iPhone is a serious time saver. That is built into the Apps and nothing to do with Lastpass.
It's easier going to Keychain to obtain passwords for manual input or searching.
I sorta like the copy password feature in Lastpass for apps and sites that don't work well with Keychain.
Today I created a back up spreadsheet file with Numbers in iCloud and password protected it.
After I experiment with the Credit Card feature in Keychain and if it works the way I like, I just might let go of Lastpass.
I have the free version of Lastpass so no hurry to get out of it 100%.
Since you seem to access on other computers, it might be a convenient option for you.
I'm missing Seattle by the way. Very cool city....in the summer.