The PX4D came by first because it was the most attractive pocket guitar processor (to me) which bothers to include a midrange control. This nifty little box also accepts bass readily. In addition to the guitar related offerings, the PX4D has metronome & backing track modules for a one-man jam. As if these aren't worthy enough, the manufacturer includes a recording facility which accepts your MP3 (or other similar devices) to be played back at slower tempos for educational purposes. It also loops your recorded phrases for that insatiable solo jam.
On days when I don't require back-up shenanigans & wish for a plug & play moments, the PocketPOD would be employed. I've never been a fan of the LINE6 products before, which is attributable to its very fabricated guitar tones but this little red bean has its appeal. It isn't trying too hard to be its more elaborate elder brothers but the fundamental details here are more pleasureable than being digital muck.
The Ibanez TS7 on show here is simply there for comparison's sake but it's the most utilized pedal I own, getting more assignment time than its more celebrated siblings, the TS9/ TS808 (which I also own).