Analyzing investment in senior unsecured debt given Debt/EBITDA at each debt level for both companies

Analyzing investment in senior unsecured debt given Debt/EBITDA at each  debt level for both companies

Here  is what I'm looking at:                    Company A       Company B

                                                               Gross Leverage (Debt/EBITDA)

                                                              Company A       Company B

Secured Debt Leverage                      0.69x                    1.08x

(Secured Debt/EBITDA) 

Senior Unsecured Debt Leverage     1.60x                     3.96x

(Secured + Senior Unsecured Debt)/EBITDA 

Total Leverage                                     2.42x                     4.87x

If I want to make an investment in Company A's Senior unsecured debt, how would I first decide  which company is most creditworthy?