Blackmores pregnancy and breastfeeding gold is your best option.
I work in a pharmacy and have been told by all 3 pharmacists at my store that it's the best option if you want omega 3. There is 300mcg less of folic acid in blackmores compared to elevit but blackmores still has 500mcg of folic acid in there which is sufficient
Also, the fish oil in the blackmore pregnancy gold is not only good for baby's brain development but for your joints too! Your joints are very likely going to suffer during the 3rd trimester so the blackmores works out more beneficial for your last few months of pregnancy.
One last thing, quite a few pregnant women I've spoken to have said elevit did nothing to help constipation, therefore they were always constipated while taking it. The blackmores pregnancy gold doesn't seem to be as bad for constipation...doesn't take it away completely but definitely helps!
I'm 21 weeks and taking blackmores and the thing I love about it most is that it's a capsule that slides down to throat easily, not a massive powdery tablet that's hard to swallow like elevit.