set.seed(1234)  # for reproducibility
B = 10^6; th = 6
x1 = runif(B, 0, th);  x2 = runif(B, 0, th)
m = pmax(x1, x2);  t2 = 1.5*m
mean(m);  mean(t2);  var(t2)
[1] 4.000053   # aprx E(M) = 4
[1] 6.000079   # aprx E(T2) = 6 (unbiased)
[1] 4.506313   # aprx Var(T2) < Var(T1)
t1 = x1 + x2
mean(x1);  mean(t1);  var(t1)
[1] 2.998866   # a[rx E(X1) = 3
[1] 5.998      # a[rx E(T1) = 6
[1] 5.999963   # a[rx Var(T1) = 2(36)/12 = 6 > Var(T2)