What is the best weapon to use for self defence??

I think there are too many things that can go wrong with those kinds of self-defense weapons. Pepper spray can accidentally get in your eyes and you can miss with a taser.

Guns are a HUGE responsibility and take a lot of time and patience to become proficient with one.

Personal alarms are great and are very easy to use. They don't inflict any pain BUT anyone wanting to do you harm is very easily deterred from attacking you. It's hard to really explain how LOUD these things are.

I'd say they're good if you're needing to find a little bit of safety in a more populated area. They won't work for obvious reasons if you're more secluded.