The heavy blaster is better in 99% of cases. While it has higher flux/s, it also has higher efficiency so for a given amount of flux you get more damage out. Firing some, then waiting (or venting), then firing more with a heavy blaster will do more damage in the same time as a mining blaster just fired. Mining Blasters are ok to have early game against armor tanks because they are common weapons to crack heavy armor when other options might not be available, but HB's are just better.
Pretty much the only time a mining blaster is actually better is on a Hyperion or phase ship when you fire a single shot then go invulnerable again.
i honestly do not understand why people dont like the mining blaster so much.... ESPECIALLY on high tech ships...
shrikes, wolves, or auroras are prime candidates for mining blasters, you know, skirmisher that need a heavy punch.
the thing with the mining blaster is that it has a high per shot flux cost, but is overall quite flux efficient, again, with the caveat that the ship using it can acutally take the flux burst, and vent it during the reload. and high tech SO ships are PERFECT for that, high flux cap, quick passive venting...
another thing with the mining blaster is that it is acutally really good in combat... its burst nature allows it to very reliably overload enemy ships, burst down openings from flankers, and "sneak" shots behind enemy shields after they have dropped said shields to vent.
ironically, the mining blaster is alot more flux efficient than the heavy blaster... and costs less op too...
ships that utilize energy slots usually dont play the dps game, since dps energy weapons just do not work in this game... but bursting? ye boy
and ye, like someone else said before already, mining blasters arent mainstay weapons, imagine them like a secondary grenade launcher strapped onto your assault rifle.
i usually use them on shrikes, that have 2 ir lasers, and an ion cannon, with pd and whatever armor missile i have laying around