Nothing against Andrew Niccol, who wrote and directed Gattaca, but the same film with the same actors, directed by Ridley Scott, is really something to contemplate.
If ridley scott did Gattaca, there'd definitely be more of a budget on the sci-fi setting. It'd be more grounded and gritty with less of an 80s aesthetic.
As for whether it'd be as good as Andrew Niccols' version well... that's hard to say given Scotts hit or miss track record.