Laptops are better, because they have an integrated uninterruptible power supply, but worse because most can’t fit two hard drives internally. Less of a problem, now that most have USB3. Just run external RAID if you have to.
Arguably, a serious home server will need a UPS anyway to keep the modem and router online, but a UPS for just the NAS is still better than no UPS at all. Also, only a small UPS is needed for the modem and router. A full desktop UPS is much larger.
Laptops are better, because they have an integrated uninterruptible power supply, but worse because most can’t fit two hard drives internally. Less of a problem, now that most have USB3. Just run external RAID if you have to.
Arguably, a serious home server will need a UPS anyway to keep the modem and router online, but a UPS for just the NAS is still better than no UPS at all. Also, only a small UPS is needed for the modem and router. A full desktop UPS is much larger.