I should add that an option is to use both ASB Securietes and Sharesies, to get the best of both.

I curently have about 90% of my portfolio under my own CSN acessible via ASB Securites, with the other 10% in Sharesies. I use Sharesies to do rebalancing and dividend reinvestment (for companies that don't have a divident reinvestment scheme) because the brokerage is much lower and so I can make smaller, more frequent trades than would be economic with ASB.

Also, Sharesies is being actively developed with new features being added all the time, while ASB Securitiues seems to be largely static, so I expect the pros and cons will move in Sharesies favour over time.