I think that the Hobbyboss kit and the Sarissa kit have different functions.
If I want one landing craft for a diorama, the Hobbyboss kit has more detail.
However waterlining it nicely will take quite a long time. I waterlined the Revell Viking ship and it was a surprisingly big job.
If I want several landing craft for a wargame scenario, then the Sarissa kit is much better.
It is quick to build and already waterline and about half the price of the Hobbyboss kit.
Mick