Lucky13
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I've only done a little bit with resin parts so I'm probably not the best person to ask but I'll try.
Resin parts are typically cast in silicon rubber molds which allow a very high degree of detail. However silicon molds degrade much faster than the molds for polystyrene plastic. That reduces the number of production runs one can get with the molds and raises costs.
You need to make sure that you are very careful dealing with resin parts if you are cutting or sanding them. The dust from them can be extremely nasty and dangerous if inhaled. And attaching resin parts typically requires the use of CA (superglue).
The only issues I've had with resin parts was the tendency of the small fiddly bits to break if you even look at them crossways. I know that some resin kits have problems with tiny bubbles in the castings which are a MAJOR pain in the arse but I haven't done a full resin kit yet, just a few accessories here and there.
You said *rse!
Be kind and put the money in the jar.....