I don't have kids (yet) but I'd argue Argentina is one of the better countries to raise them provided you have money. Regarding speaking Spanish, I will say that being able to just makes life 100% easier here because so few people speak English. I know Argentines love to share maps which show them with the highest English proficiency in LatAm, but that hasn't been my experience at all, and it only decreases the further you get away from CABA.
Most of my friends here are Argentine or Latinos from South America. I've met a few of them here, and knew one of my best friends before moving. For me integrating hasn't been too difficult; I actually take care of the finances, health insurance, bills, contracts, leases, etc. vs. my husband who is Argentine so I'd argue if I can do a better job with these things despite Argentine society and Spanish not being native to me I've come a long way.
Whether any of us will ever be fully integrated and considered Argentines is another topic too.