I don't use heat but if I ever get the desire to I'll consider the two you recommended above. Your comment actually speaks to me, as right before starting my transition I noticed a chunk of short, broken hair (like 3inch long) and the culprit was indeed my iron and its corner edges which snagged on my hair. I was so upset when I saw a ton of strands hanging on there!
Anyway I asked because your pattern disrupts in certain areas, close to your ends. It looks like the heat might've affected certain areas a little so do be careful, good thing you're not doing so anymore! You have a lovely pattern, take care of it curlfriend Gorgeous eyes by the way!