According to Larrin's tables:
toughness--
15v: 3
Maxamet: 2
edge retention--
15v: 10
Maxamet: 11
corrosion resistance--
15v: 4
Maxamet: 4.5
So, should be quite similar, overall. But I wouldn't be surprised if Spyderco's 15v outperforms their Maxamet, because they're consulting with BBB on the heat treat, and he's been refining his protocol for quite some time.
toughness--
15v: 3
Maxamet: 2
edge retention--
15v: 10
Maxamet: 11
corrosion resistance--
15v: 4
Maxamet: 4.5
So, should be quite similar, overall. But I wouldn't be surprised if Spyderco's 15v outperforms their Maxamet, because they're consulting with BBB on the heat treat, and he's been refining his protocol for quite some time.