If you are going to handle pallets a lot, definitely get the dedicated forks. With those bolt-on forks, the bucket blocks your vision of the pallet plus the forks are out front so far that it gets hard to control the side-to-side position. Then there's the issue of reduced machine capacity with the load out so far in front. That 2400 pound capacity is probably more like 1500 pounds, maybe worse, with the load shifted forward. If you overload the setup the back wheels are going to come off the ground, even if the hydraulics can handle it.
I imagine the bolt-on's would be OK for such things as unloading a single pallet from the occasional delivery truck; where the truck driver can help guide you as you engage the pallet with the forks, and the weight isn't that bad.
I own a used forklift with sideshift and mast tilt. It's hard enough to get good at seriously moving pallets with such a purpose-built machine, never mind a jury-rigged setup like bolt-on forks.