That all depends on what you are mining for, in general mining with multiple types of metals/minerals being mined laser will always beat volume wise any other type of mining, value wise it could be a different matter.
Tritium the fastest way volume wise is SD/SSD mining with obviously lasering any remainder of these type of rocks, a 4 SSD rock may produce up to about 36t.
There can be a lot of variation on Core density in rings and also a lot of distraction from large volumes of SD/SSD rocks, if you are not to fussy about what type of Cores you are mining try a run or two away from the hotspots, you may find that although there are less glowing rocks more of them will be cores rather than SD/SSD rocks.
Type of ship can also be a factor, your medium sized is faster manoeuvring around a rock than say a T9 or Cutter, but I do mainly a mixed style of mining - hoovering up anything that's worth while, PWA'ing but prospecting rocks between rather than fly direct from glowy to glowy.
The rings themselves can also vary a lot, even in just Pristine rings the number and distance between rocks varies and the amount of good rocks is another factor. Another thing, just because a ring may not have hotspots does not mean that it is not worth mining.
Skill, there is a certain amount needed at times both in spotting the right rocks, not only the Cores from the SSD's but the ones that are going to take too much time to mine properly - fast spinning Tritium SSD's can be a waste of time and ammo. This can also be a factor in laser mining some shapes can be better than others.
Try to at times to think outside the box, sometimes it works sometimes it does not
