I have done ribs every which way and it depends on the mood.....
But as a general rule, I tend to prefer 321 @ 225 for spares: These are close to FOTB but not 100% FOTB
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But for Baby Backs (I trim all the loin meat off) I don't wrap and run them @ 235 till tender, flex bent test (INT 196 ish) usually 3.5 hours with glazing .....Then I glaze and wrap and rest (30-60 min) at temp (170)....
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Trimmed baby backs like the above rule in our house! These have just the right amount of bite and are not FOTB!