Just to make sure this is staying on topic, the OP is talking about the latest version of pedals - the "n" series. The G3xn is a small format pedal with attached exp pedal. The new G3n/G5n are also generally regarding - amongst those who previously owned the G5/G3 - to have significantly better modeling, so I'm not sure that using the G3/G5 as a basis point for comparison is fair.
If we use price, ease of use, size, and quality of tone as the basic criteria, the Zoom G3xn is a very good choice, especially if you're looking for the best quality amp/cab modeling possible in a sub-$300 (new) pedal.
Being spoiled by Fractal gear makes comparing "quality" among low-end pedals all the more difficult, and IMO you're not really going to get close until you step up to the Atomic Amplifire stuff, but this brings you to a whole different price point, too.