The first thing that you should check in an Israel SIM card is the coverage of the mobile signal provider. Most of these will have excellent tower positioning at the most important cities but these can thin out significantly as you move away from the centers.
If you are staying within the metropolis and tourist spots, then this should not be a problem. However, those who plan to travel elsewhere should definitely try to check the maps.
Another consideration is the included consumables. Some of these come with free data, calls, and SMS out of the packet. The volume will depend on the price of the SIM. Tourists can available of special SIMs with all-in packages.
As for the locals, the prevailing rates and services should be compared. They are more likely to hold on to the SIM cards long-term so they should pick a company that they can work with for years.