I'm no expert here, but I'll throw a comment your way. The Amasa does have a slightly better or better component package (depends who you ask when comparing Shimano to Sram)
SX-5 level is meant to compete with the Deore line, below Deore is Alivio (then Acera and Altus).
If it were me I'd stick with the hardtail; for casual riding I don't see the need for a full suspension. More moving parts means more to maintain and more to possibly break. For the price the Amasa doesn't look to be too bad of a bike.
Disclaimer: please keep in mind this is from a hardtail rider with no experience in full suspension bikes. I believe you should get the most bike for your money.