I am sorry, you must got something confused. Northshore is physically OUTSIDE desa park city. The great value about Desa Park city is what turned out to be a great harmonious project as a whole being nestled in great landscaped greenery sharing great amenities and now after a few years is showing that it was built with decent quality (Not convinced about Zenia though). For houses it is GOOD that it is not at a commercial hotspot or transportation hub. Additionally, they're selling still at 600 for the land plot alone, or the low RM500's or less for the built up if you like to calculate that way (though it's wrong), and most of the units seem to be bought-to-live or well-managed and not amateur investors. Till today Desa Park City is a good place to buy in, whether the new projects or old one, and it has the potential to appreciate.
Northshore condo sits outside the city, and already in the low to mid 600's. Make the distinction of what is a good buy now and what used to be. Regardless of the Mall and the other features that will open THEN, the price currently is not good for investment.
For example since you compared with MegaMall, an excellent condominium indeed, it is offered at below RM590. Is it reasonable that a condo that WILL have a Mall and a hospital in a few years somewhere in the neighborhood, be a good investment when it is already priced higher than a luxury condominium that is smack attached to two great Malls (Megamall/Gardens), a KTM station, a dozen bus lines, and dedicated taxi station?
It CAN, if it had the chops; like better amenities, better location, better services etc. But since it doesn't, then no it is not reasonable price to buy at. It has been buying time for Desa Park City for a while and still is, but it's not time to buy Northshore at all if you're looking for an investment.