Pirelli pzero tyres - whats the difference between these two

[vantager]

Found these two tyres from tyreLeader for my Boxtser

265/35 ZR20 99Y - £194
265/35 ZR20 95Y N0 - £203

Now, I realise the N0 means 'Porsche approved' - but can anyone really tell me (not guess!) the physical difference that makes?
To me, the cheaper typre looks better as it has a higher loading (99 vs 95).

[vantager]

Yes, its a 2.7 981. Did not think about the tyre wall - thanks.

[vantager]

So of the 4 tyres that seem suitable for the rear on a 981 Boxster, and 'Porsche approved', namely:

Goodyear Eagle F1 Asymmetric 2 265/35 ZR20 95Y - N0
Pirelli Pzero 265/35 ZR20 95Y - N1
Bridgestone Potenza S001 265/35 ZR20 95Y - N0
Michelin Pilot Sport CUP 2 265/35 ZR20 95Y - N0

1. does anyone have a view on ones to avoid (I have heard of people using the Goodyear and Michelin here) ?
2. has anyone put a NON Pzero on the rear, leaving pzero's on the front (as my rear's need replacing but not the fronts)