So, without getting into actual numbers...
LTD, SW tie ratio: Xbox One > PS4
PS4 HW gap growth not yet translating to corresponding increase in SW sales split on non-exclusive titles.
Couple hypotheticals from that is that the Xbox One has more core, high purchase rate per install gamers than the more mass market PS4 that is selling more software overall. Not surprising really. Other is that SW metrics can trail HW, so we might see these SW measures begin leaning more towards PS4, but it's not happening yet.