Folate vs Folic can't really be generalized into "natural" vs "synthetic" and it is a superficial uninformed health blogger misinterpretation.
Folate is a name for a SALT deriving from folic acid (like any other salt: ie. nitrates are nitric acid salts, sulfates are sulfuric acid salts); folic acid needs to be converted to folate to be further used in our bodies - and folate itself needs further conversion to actually work:
our organisms use several enzymes (not only the MTHFR enzyme) to convert folate into usable form called methylene-tetrahydrofolate, a molecule that is involved in several complex biochemical pathways involved with DNA synthesis (production) and methylation: when your baby grows, it needs LOADS of new DNA for the new cells - the DNA synthesis during pregnancy is running at its MAXIMUM speed and it requires all the building blocks for it, and methylene-THF is a crucial percussor in making those building blocks for DNA.
if you are already taking 800mg folate, you definitely DO NOT need to take another dose of folic acid on top - the recommended doses for pregnancy vary between 400-800mg - introducing 1600 a day is useless. Especially since folic acid needs to be converted to folate and with high concentrations of folate you are taking, the conversion process is even slower.
IMHO, i'd go with folate over folic acid anytime as it requires one step less to be processed by our bodies, and it is absorbed better so you use it more effectively.