Design and build - Metal vs Plastic
It's HTC's metal vs Samsung's plastic all over again – and if you preferred the HTC One's slick all-metal unibody, then the One Mini will win this round too – despite the plastic outer band that gives it a slightly cheaper feel. The S4's plastic build does have one advantage, though – you can just peel off the back and whack in a new battery when you're running low.
Screen - Sharper is better
Both phones have 4.3in displays, with Samsung opting for Super AMOLED and HTC using Super LCD-3. The HTC One Mini's 720p screen bests the Galaxy S4 Mini's non-HD display though, with 341 ppi compared to the S4 Mini's 256 ppi. HTC wins this round.
Camera - Cream of the crop
We'll have to reserve judgement until we take detailed side-by-side comparison shots – but if low-light photography is your thing then the HTC One's light-guzzling Ultrapixel camera is likely the way to go, based on the performance of the same snapper in the HTC One. If you tend to take photos in good lighting conditions and want to crop into photos without losing as much detail then the Galaxy S4's 8MP camera will be better suited for your needs.
Power - Neck and neck
Both phones use Qualcomm's dual-core Snapdragon 400 processor, though the Galaxy S4 Mini's chip is clocked slightly higher at 1.7GHz compared to the One Mini's 1.4GHz. With 1GB of RAM on both handsets, their power – on paper, at least – is practically equal.