I agree with the gentleman above - that's a big space for either light.
The HLG has a lot of blue in it. Blue is great for compact plants but a couple of researchers have shown (Bugbee just released a paper on this) that increasing the % of blue light in flower has a direct, negative impact on yield.
The PPFD map for the Mars is pretty good - there are a couple of independent sites that have provide that info.
And I voted for the Mars with my $$ - I bought the SP 3000 earlier this year. It's worked well for me. On the other hand, I have zero experience with HLG.