No, it's not that 2x1 pieces are more effective by themselves. But they become more effective, if cris-crossed with each other in a brick wall pattern. Just stacking them on top of each other yields little benefit. You have to create a weaving pattern.

Thanks for the feedback it's very to fix the design of my ships, I understand so 2x1 in armor is more effective, well I will start to replace the 1x1 on my ships in project then on those already posted.

Beautiful ship. Small reactors should probably be replaced by a single large one, as they produce triple batteries and are way more efficient. You also don't need that much power to fuel your limited offense and 2 shields. You should always aim to deplete your reactor fully, because energy is so expensive.
One more thing, seeing you seem to love armor: you should do armor weaving. Only use 2x1 pieces and set them up in a brick wall pattern (half of 1 bar blocking half of the one behind it). This can double your armors effectiveness, because to drill a hole one would have to destroy more blocks.