OPNO, welcome to the forum!!![]()
There are some differences between the 2 kinds of stairs, but they are minor if the person installing them doesn't do it properly!
Linered stairs tend to have wrinkles, either because the liner wasn't made 'just right' or because the stairs themselves weren't assembled to the 'specs'. If you have a return in the stairs, it's just one more place to leak. However, as it's what you already have, the replacement should be a little easier than retro-ing in the fiberglass steps.
The fiberglass steps have their own set of problems. If not fully and properly supported they sag and may potentially crack. The faceplates, where the liner ends and the steps begin, can be a constant leak source (again, the competence of the installer is key). A lot of installers, that I've seen, have trouble keeping the bead for the liner straight around the stairs, it's really not that hard but somehow escapes them. you may need to purchase some small 'filler panels" - like 2 - 4" to mate up to the pool walls.
This is a quick take on them but it all comes back to the competence of whoever will be doing the job! Either type will meet the need for entering the pool - find a contractor whom you can trust to do the job correctly and let him do whichever he's most comfortable with!
If you have any more questions or concerns with this, I'm here almost every day. Again, welcome to the forum and i wish you well with the stair replacement![]()
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