Hi,
I don't really have any experience with Pod Go. I agree that pops and clicks are a matter of your CPU and computer system not handling the buffer size. Depending on the driver and the DAW you use you need to change it to a higher sample size. There are a ton of videos on youtube on how to change those settings for all kinds of devices. The quality of the driver software that the manufacturer of the interface creates has a lot to do with the sample rate you can run also.
As far as the focusrite 8i6 it sounds fine for my use. The mic pre's sound fine, are pretty neutral and flat unless you activate the "air" feature which adds high end. Better doesn't really mean much until you can actually tell the difference in sound. I'm honest I probably can't. I record vocals in a closet and mix on presonus monitors.
The 8i6 is 300 bucks, it does what I expect for the price. The Helix was 1500 and it is a terrible "interface" but a great hardware amp and effect sim. They were made for different things. Heck I had to send my Helix in for repair because the mic pre fried the first time I used it with a condenser mic. I'm not saying any product is correct for someone else, but in my experience use the right tool for the job. My Helix makes nice guitar amp and effect sounds. I use it for that. The interface works well to convert sounds to digital and stuff them into my DAW.