Connetix, Magna-Tiles, Kmart Anko, Learn & Grow and the rest, compared by people who do not sell any of them. Every ranking competitor in this niche is a shop reviewing its own stock. We are not a shop, which is the whole point.
Buying one good set: get Connetix. Not sure your kid will care: start with Kmart's Anko tiles, they connect with everything else if you upgrade later.
Families who want one set that lasts years and holds big builds. Magnets: very strong. Price: around AU$169 for the 102-piece pack (price-controlled, similar everywhere).
The current benchmark. If you are buying one set to last from age three into primary school, this is the safest money you can spend in the category.
Testing whether your child cares about magnetic tiles at all. Magnets: weak to moderate. Price: roughly a third to half the per-piece price of Connetix.
Honestly fine as a trial run. If the tiles get played with every day, upgrade to Connetix and keep the Anko tiles as extensions. If they gather dust, you risked very little.