Obviously they didn't go head-to-head and this was a few years ago so take it as you will, but my recollection is that Samhan was a bit quicker than Landale usually looks. Despite Landale looking in better shape, his game seems a lot more methodical and I can see that not translating as well to a pro situation where it's not all set up around his strengths. But #299 is right, it's hard to know what he's actually capable of given that St. Mary's only want him to do a fairly limited number of things.
Markkanen made him look very ordinary in the NCAA tournament last year. He's gone on to be effective as a rookie in the NBA so it's not like he didn't have tools, but Landale had a good opportunity in that matchup to show that he should be an NBA consideration eventually, and didn't take advantage. Unless he has a euro passport, I think the chances of him ending up in the NBL next season are pretty good.