Without bugs, [Boltor Prime] outperforms [Telos Boltor] by approximately 10%.

UPDATE Oct 2023: [Telos Boltor]'s [Galvanized Aptitude] bug has been fixed, so [Boltor Prime] is again the superior variant for DPS.

EVOLUTIONS:
Evo II: Use Crimson Overture if not using channeled ability (gives +10 dmg on top of 60 base dmg), and use Hunter's Mantra if possible if using channeling ability for punchthrough (swap [Primed Shred] for [Vile Acceleration] if you do this)
Evo III: Rapid Reinforcement or Swift Deliverance
Evo IV: Commodore's Fortune

FLEXIBLE OPTIONS:
Galvanized Aptitude - flexible for Primed Bane of Grineer/Corrupted to min max slash DoT damage against grineer/corrupted
Primed Shred -flexible for [Vile Acceleration] (particularly if you run channeled ability + Hunter's Mantra evolution)

FOR CORPUS: Swap Hunter Munitions and Rime Rounds for Infected Clip + Primed Expel Corpus
FOR INFESTED/ACOLYTE/THRAX without armor strip: Swap [Hunter Munitions]. [Malignant Force] and [Rime Rounds] for [Stormbringer], [Infected Clip] and [Serration] to make raw corrosive