resin kits

For me the primary attraction, both aircraft and ships, is unusual subjects.

A thing to consider- resin kits often attempt to provide all of the parts you'll need such as the interplane struts of a biplane or the masts of a ship. Be prepared to scratchbuild replacements. And sometimes I'll pick up a cheap kit of something readily available in the same "family" in order to get things like wheels or props with which to detail the resin kit.

There used to be two advantages to resin.  First, the investment to make molds for resin casting is minimal compared to the molds and other aparatus for injection (styrene) molding.  Thus, there were many cottage industry firms that made small runs of obscure subjects, if you want something different than another ME-109 or P-51 varient you could chose from the many resin offerings.

Second, it used to be the low surface tension and viscosity of urethane resins, and the detail obtainable in RTV molds allowed detail with resin casting unobtainable at the time in injection molded styrene, if the kit developer put enough effort into the pattern (original from which mold was made).  However, in the last few years new technologies have allowed larger styrene kit mfgs to produce equal detail.

In summary, well made resin kits can have detail as good as or better than injection molded styrene, and the large number of small garage-shop mfgs that can get set up in resin means a wide variety of subjects.  Not all resin mfgs, however, have, or can afford, skills to make high quality patterns/originals.

I think you can use other products to fix attach them, but CA is the most common. As far as detail goes, that depends. Resin AM sets have better detail than the plastic kit, but many resin kits are limited run, but it depends on what resin kits your talking about. Resin can be brittle, so thin parts need to be handled carefully.