If you want your slides to be minimal and clean and you don't have a lot of time to do, then Markdown works. To me, over time I am convinced that having the ability to do animations to explain technical ideas is great. While it's not impossible to do fly in/out/moving animations in LaTEX, presentation software makes it ten times easier to maintain.
I think that not everything is best explained in code. Sometimes you need pictures/animations to convey the ideas.