Blizna...the bottom line is that the type of twitch is not significant.
Neurologists do not fully understand why they occur. People with benign or pathological can have similar or dissimilar types of fasciculations. The type of fasciculation is not part of the diagnositic process for ALS.
The only part of understanding the advancement of ALS in someone that has definite MND, is, when there are pathological fasciculations, they are a manifestation of lower motor neuron involvement rather than upper motor neuron. i.e. its not the type of twitch, but that it is there. This is almost verbatim to what my neurologist explained to me, and she is mostly involved in research, is widely published, and would know, if anyone would, about this subject.
Hope this helps put it in perspective.
I do have a higher percentage of slight twitches (by far) than the more violent ones, but that's just me.
You said yourself in your most recent post in this thread, that you've read that one type is more typical than the other, but then you followed it up with the statement of "(no rule of course)" so really, you've answered your own question. There are many other symptoms that help to determine what someones problems are stemming from than dwelling on fasciculations, or the type they seem to be.
I feel like you're trying to draw reassurance that because you have what you feel to be stronger ones, that this is an indication that you do not have ALS. A more important way to find comfort that you're not facing this, is that (I think) you'd said you didn't have atrophy, I don't remember if you have weakness, but I'm thinking you don't feel like you do,.
Most importantly, you doctor was comfortable with just an X-ray, not wanting to pursue it as far as an MRI even. This should give you confidence, and if it doesn't, perhaps you should seek out another doctor for a second opinion.