I’d choose Force Field..... From what I remember a “Field” was more versatile than a “Sheath”
If I remember it correct; both surround the body... the Sheath was form fitting, while the Field was a bubble around you.........
Both are superb for ‘Armor’.... But a Sheath was specific for ‘Armor’ getting many Automatic FEATS while used for self preservation.
But, a Field could be manipulated into various simple shapes... such as a form fitting body suit, or a disc like frontal shield, or even blunt / edged projectiles...... You could even design simple tools and weapons.....
And under precise control a Field could change colors, patterns, opacity, temperature, emit light or sounds, or even be used as a ‘Filter’ to create chemical reactions, such as converting Water or Toxic Acid into Breathable air..... A Force Field was quite versatile.....
One of the main properties about a “Sheath” was you could transmit it’s strength on to a weapon you carry, making that weapon considerably more powerful...... And a “Sheath” was more resistant to certain types of attacks, such as making your skin, muscles, and bones as tough as ‘Armor’.........
Such as a ‘Heat’ or ‘Cold’ Sheath gives you an automatic level of invulnerability to extreme temperature...... but considerably less protection from other types of attacks..... A Kinetic Sheath would give you ‘Armor’ to Physical Attacks......
A Field is more used for external utilities, While the Sheath was more for internal body utilities........
I don’t think the Form or ‘Source’ of Energy for either ‘Sheath’ or ‘Field’ is all that relevant..... If the Energy Form is Kinetic by default.... You’d get MANY automatic FEATS involving Physical Attacks and Defenses...... but significantly less Automatic FEATS for Electricity, Gravity, Temperature, Toxic Radiation or other types of ‘Energy’..... But after a few Power Stunts other forms of Energy Manipulation would be mastered....
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