Samsung S3 or iPhone5?

[Contrarian]

Excellent question!

For the tasks you mention, I would go with the Samsung S3.

Texting can be done via regular typing or swiping your fingers over the keys to create words.

Music sounds great on it and Instagram for Android is very smooth and easy to use.

The camera is 8MP and has a fantastically strong flash.

One other thing to consider is the brightness of the display. Since Samsung is also a maker of TVs, the Super-AMOLED screen is amazingly vibrant. YouTube clips can be viewed in HD. This also helps with texting because the bright display enables easy reading of texts. The font size can be adjusted to your comfort level.

The speakerphone is loud and clear! You can either manually start it or turn it on its face to activate it.

One more feature that differentiates it from the iPhone is facial unlock. You can train the S3 to recognize you in different settings. If you'd like an additional level of security, you can set an unlock pattern code that only you know.