Electrum and Sparrow are the ones you should use for onchain.

A LN wallet MUST be also an onchain wallet.
LN cannot run without onchain.
Ignoring LN will cost a fortune later. Learn it!

best option for security and privacy for onchain transactions these days?

Onchain must be used exclusively for opening/closing LN channels, not doing shopping.

Please read more the following guides:

• https://darthcoin.substack.com/p/bitcoin-and-privacy
• https://darthcoin.substack.com/p/private-lightning-nodes
• https://darthcoin.substack.com/p/lightning-cleaning-machine
• https://darthcoin.substack.com/p/lightning-network-submarine-swaps
• https://darthcoin.substack.com/p/bitcoin-be-your-own-bank-think-like

and always remember this image that shows how you should organize your stash on 3 levels:
https://i.postimg.cc/MTL2kvT0/3level-stash.jpg