Poolside seating lives on the deck, just outside the water, where it still takes constant splash out, sunscreen, wet towels and full sun. Everything in this category is molded from UV stabilized resin, so there is no rusting frame, no wood to reseal each spring and no painted finish to blister and peel.
Start with circulation, not with furniture count. Keep a clear 36 inch walkway between the coping and the nearest furniture so wet feet always have a safe path. Group deep seating away from the splash zone and keep loungers along the sunniest edge. If your deck bakes between late morning and mid afternoon, budget for shade at the same time you budget for seating, because an unshaded deck simply goes unused during those hours.
Cushions are sold separately from frames throughout this range. Outdoor fabric is what eventually ages, so buying it as its own item means you can refresh the entire look in a few years without replacing structurally perfect furniture.