Well, XLR gives you a balanced connection, while the Jack connection is unbalanced. Unbalanced connection = electromagnetic interference. Note that on-board audio interfaces are pretty weak too.
Here you can find my [dummy test](https://www.dropbox.com/s/or4pwjrvma17x2p/test.wav?dl=0) (non-native speaker), [same dummy test + music](https://www.dropbox.com/s/u2epjg19ah23btn/test%2Bbg.wav?dl=0). My current setup: Focusrite Scarlett 2i2 1st generation (includes a microphone, the audio interface and headphones) + [a windscreen](https://www.thomann.de/gb/the_tbone_windschutz_ws60.htm), which is even better than popkiller. I also use Yamaha HS8 studio monitors but that's not really important for podcasts. Music in background is good. Not sure about ambient music. Give me some time and I will make some simple beats that you can use in your video sessions.
