Always go for reliable power over secondary effects, especially for sweepers.
This means Throat Chop is the move of choice.
Shiftry is too slow to be anything but a Sun sweeper.
Shiftry @ Focus Sash
Ability: Chlorophyll
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Swords Dance
- Solar Blade/ Leaf Blade
- Throat Chop
- Low Kick/ Rock Slide/ Bounce
Bounce is only there because Max Airstream gives you a reliable speed boost which would benefit you after the Sun goes down.
Despite you mentioning that you wanted to go physical, I'd just like to suggest that this generation the special Shiftry seems more powerful, mainly because it gets Heat Wave to help sweeping under the sun, and allowing it to set the sun up by itself through Dynamax.
Shiftry @ Focus Sash
Ability: Chlorophyll
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Nasty Plot
- Solar Beam
- Heat Wave
- Dark Pulse
Never choose Beat Up for competitive, it's such a gimmick.