Are all wooden pallets created equal? And if not, is there one that you definitely should use and one that you should definitely avoid?

Abbreviations:
HT = Heat Treated
KD = Kiln Dried
MB = Methyl Bromide
SF = Sulfuryl Fluoride
Blank = Pallets with no symbol are not used internationally and don't require treatment

Argument for MB pallets:
(Dainer Made)    • I spoke to the EXPERT putting Methyl ...  

Argument against MB pallets:
(DIY with Dave)    • What You Need to Know About Pallets T...  
(DIYForKnuckleheads)    • A BEGINNERS GUIDE to Finding Pallets  

EPA Document on Methyl Bromide (first paragraph covers toxicology and dangers of short term exposure): https://www.epa.gov/sites/default/fil...