Personally, I like the horizontal bandsaw. Properly set up and maintained, they will cut square enough. Quieter and safer than the miter saw too. If you are set on using a miter saw, I can't agree more with the statements about clamping the work. The other thing to know is that the right blade makes a big difference in both safety and cut quality. Here is a link I found about hook angle. A blade with a high hook angle meant for soft wood, this is what you'll find cheap at the big box store, is much more likely to grab the work. More teeth usually means a smoother cut as well and increases cost. Buy a good blade once, don't abuse it and it will save you money in the long run.
Here's a link about hook angle:
https://woodtechtooling.com/FreudToo...dep12Hook.html
Ivan