Sawsall blades

Hi is it just me or do DeWalt blades seem to break and bend easily?. I like the Diablo and Irwin alot better I have not broken or bent a Diablo blade yet and im pretty hard on blades. What about spyder blades? How do those fair?. Anyone ever use a sawsall to cut open a ac compressor does it work if you use one with tiny teeth like a hack saw has or should I start with small teeth then use one with big teeth?. Speed wise is small many teeth better or fewer teeth and bigger ?. Thanks.