Favorite Indexes/ETFs for Credit Spreads?

what are some of your favorites to trade from a credit sread / IC standpoint? i know the spx/spy are popular, but are there some others that might have an advantage to trade spreads? for instance, what about the inverse/double inverse ETFs such as DXD, TWM, etc? more volatile, but worth trading on a spread basis?

thank you for any thoughts.

fakie
 
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