Volatility regime — the only strategy with no view on direction. It measures whether risk is expanding: it steps aside when volatility spikes above this name's own normal, and participates when things are calm and price is above its trend. The natural partner to a capital-protection mandate.
"Difference" is strategy return minus simply holding the asset. On short, mostly-rising history these strategies tend to win only where the asset fell (they sat in cash) — real edge needs more data and choppier markets.