There are no "good" or "bad" material, but rather bad designs or bad workmanship.
The video shown in example is clearly made by a GRP enthusiast who wants to highlight the advantage of the GRp over the aluminium...
When the guy says that the GRP has only surface damage, is still intact and kept its integrity after the puncture test, he is, to my opinion, not saying the truth at all.
Everybody can see that the sample has been as damage (if not more...) as the aluminium, that the de-lamination has occured both side and that the whole thickness of the sample is impacted. there is not leak test to even ensure that the sample was not punctured at all.
On the aluminium sample, the size of the hole make it easy to plug
or to repair on the opposite.
On the repair point of view, it is not obvious to me that the GRP is soooo easier to repair.
First of all, you need to have the repair kit onboard, wich is not always the case on GRP boats I met.
I can also have some repair kit and tool for the aluminium and for emergency
situation, a rivet tool, some rivets, some square inches of aluminium plate, hammer, a hand drilling tool and some sealant
, nothing costly or not easy to store and that is most of the time already in everyone tool box.
Secondly in the case of the OVNI accident
, the damages of such extent, and length, on a GRP boat would require so much repair material, that it would have been impossible to repair the boat on site, in order to keep it afloat, and reach the next shipyard to perform a proper and final repair.
The aluminium boat, not being leaking,was able to reach its next shipyard, without any major repair and stayed afloat.
Of course I am an aluminium boat owner, so I can not be considered as totally fair towards other materials, but, again, to me, trying to proove that one material is over the other ones is totally non sense.
I am working in the oil
and gas industry and the quality control area and always found out that any material is OK for a particular application, proven it has been well chosen, well sized, well manufactured and can never be compared to a different one as there is always differences and advantages.
There is a point where the choice has to be made, and for the same application in all extent, you may have to choose a different material than the previous one, simply because the previous one is not available, not authorized and so on...
The most important to me in the choice of your boat's material is how much are you familiar with the material and how much can you repair it and survey
it by yourself ?
This is the main criteria to me (regardless the cost criteria of course, but quality boats of any kind of material are more or less in the same range of prices usually).