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?

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