Fastest design

 # of 32bit adder (adder32) : 4
 # of 32bit comparator (comp32) : 2
 # of 1bit mux (mux32) : 2(two instances) x 32(for 32bit inputs) = 64
 
 area  = 4*10391 + 2*4304 + 64*26 = 51836 um2
 
 critical path is adder32->comp32->mux32.
 
 speed = 1.15 + 0.84 + 0.21 = 2.2 ns
 
 You can do for the smallest design by yourself.