Truthfully not a whole lot, I'm kind of a one trick pony lol
Well, then a lot has to do with your needs. You already have the X3 Live (as do I!) so you know what a processor can do for you. As you know, the cool thing about the processor is that you have many more possible effects available than just a single pedal. That's the good thing. The bad thing is that you ONLY have those to choose from (unless you're using a profiler. Then you could profile a pedal or download a profile).
For me, I use something like the Helix because of several specific reasons:
1. It takes up less room on stage than an amp and physical pedalboard.
2. I can fit it in my little car!
3. It sets up faster. I only run a single XLR to the mix or snake head.
4. By running to the mix, I don't have to worry about extra noise on stage.
5. I can create patches that range from rather simple to pretty complex, depending on the song.
6. The work flow of the Helix works well for our band situation, where we have to go between rather different sounds very quickly.
But...that's just me.
There is value in simplicity, too.
I am a big proponent of use-case. What does the situation require?
The above considerations may not apply to your situation. A physical amp and pedalboard may actually be a better fit for you, depending on your needs.
As a little aside, when I started playing live, I began with processors (a cheap Digitech RP-3, then the X3 Live). Then, I spent several years using physical amps and pedal boards. Ironically, using the amp and pedals actually helped me build patches in my processors better because I gained an understanding of how these things really work together. Now, I'm back to a processor - the Helix.
