This place isn't too far from here, and it's who I use when I need something.
https://www.wakarusaequipment.com/--rentals-equipmentBigger is better, you can move a lot of dirt quicker. An excavator is better than a backhoe if you have to dig and move dirt, it can place the dirt 180° from the hole while a backhoe can't.
Remember you need to grease all the pivot points every 8 hours, they should be greased every 4 if you are digging in water.