Trying to decide between these two types of masonry bits
My gut instinct is that you want an SDS Plus drill, for the simple reason that if you wanted an SDS Max drill, you'd know that you wanted SDS Max - They are obvious beasts.

The largest hole I've drilled would be a 4-5 inch hole through a single course of brick, which would have been better served by me renting a core drill, but I still got through in about 30 minutes - (the 10 mm pilot hole took seconds however.)

You can only get a proper answer if you can tell us what  you are planning to drill with it? General Domestic drilling? (SDS Plus) One hole to run a drain pipe through a brick wall? (SDS Plus) Demolishing several concrete columns? (SDS Max) Tunnling into a Bank Vault? (SDS Max)