Fiberglass vs Linear Pool

I'm looking to put in a pool, comparing both Fiberglass and Linear Pools. One contractor told me that there are significant problems with fiberglass pools that I should stay away from them. I have researched fiberglass pools on line and can not find any one who has listed the problems the contractor spoke of which are they need to be resurfaced after 15 to 18 years, they crack and have other structrual issues. So if anyone can recommend a site that does a comparison or has experience with a fiberglass pool I would appreciate any information you have on it

Thanks