The Bottom Line
Serta iSeries models are available in various comfort levels. iComfort Hybrid Advisor is soft with a cushioning pillow-top surface, suitable for overweight side sleepers. Serta iSeries Hybrid Advisor, and Purple 3, all offer excellent support. Purple 3 scores best for owner satisfaction due to its superior pressure-relief, better conforming ability, and excellent responsiveness. It has a medium feel and offers a balanced comfort and support for back and side sleepers of all body types. Serta iSeries Hybrids are a better choice for couples who sleep light. Off the three models, Purple 3 breaks in sooner and has least off-gassing. Warranty and durability expectancy for these three mattresses is almost the same. However, you get the most value for money with Purple 3 as it is reasonably priced for the features it offers. Purple 3 is the coolest of the three models due to the presence of hyperelastic polymer in the comfort layer instead of foams. Purple outwits both Serta models in terms of customer service and easy returns/refunds.