I listened to the stock 3.5mm cable vs 4.4mm balanced. Personal impressions only so take it with a grain of salt....
You tried comparing those cables to the stock ones in terms of SQ? (even though 1 is balanced and the other is SE).
Stock 3.5mm impressions:
- Requires more power. On FiiO Q5s 1h vs 12h for balanced. Q5s 100% volume is at 3h. No gain boost applied. No bass boost also.
- Overall sound - lifeless.
- Sound imaging - not so precise. Narrower. Details blurred.
- Bass - lacking not only sub ext but all over.
- Mids - recessed. Female vocals suffered most. I couldn't believe how mediocre Bjork sounds. No visceral impact.
- Highs - rolled-off. No sparkle. Unpleasant and unnatural.
Conclusion - differences are subtle but noticeable from the onset. Probably intended for phone use only. Overall less than agreeable to me. I'll stick to the balanced output. It's fun to listen to.