If you could I also need to know what aliminium alloy 5083 and ABS steel are best for if you can.|||The categories of craft you ask on are greatly different, and the term GRP itself is a broad label for many differing resins and fibre combinations in hull construction.
Basic GRP dingies are one of the cheapest production boats to build, requiring only low to medium skilled workers to create copies indefinitely - most other types of construction, including the advanced composites with carbon, graphite and aramid fibres, need highly skilled workers and techniques to produce the end result. None are the 'best' - rather all types of construction have pros and cons and much depends on the requirements of the design as to the likely materials chosen. While a basic knock around row boat is just fine in simple GRP, an ocean capable race craft will utilise far more sophisticated materials and build methods to get the best possible strength to weight ratio, and the price will reflect this too.
I have no opinion regarding the metals you ask on, as I am not an engineer or professional welder. You might be best contacting a supplier of metals to the trade and asking what they consider those metals best application is. Normally I will tell my metal merchant what I am doing, and accept their recommendation - thus far that has worked for me anyway! :)
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