Ospf Question

I've tried to lab this and getting unconclusive results ..

question is about Type 5 LSAs,  if a router recieves two type 5s and both are same type and metric,  which one is preferred?

eg

R1 -----------------R2-----------------------R3

all in area 0. Same ospf costs.

R1 router id = 10.1.99.1

R3 router id = 10.1.99.3

R1  is redistributing 192.168.10.0 /24 , R3 is redistributing same 192.168.10.0 /24

Which LSA does R2 prefer and why ? Im getting R3 being preferred regardless of LSA age -- but then i read somewhere lower R-ID preferred  so am confused a bit.