e46 Tweeter Speaker replacement

I know this topic has been covered to an extent but havent had a definite answer yet.

One of my tweeters, left side, packed up.

1. Is it worth it to replace both with aftermarket tweeters for better quality?

2. Can this be done without any further necesarry upgrades?

3. Should i rather just source a second hand stock tweeter?

Unfortunately my knowledge with regard to sound is very limited and I appreciate the advises.