I would get or use whatever type the child is learning on and using at home. Potty training is best when it's consistent. If toddler is using the regular toilet by some means at home while being trained, then it might be confusing or unappealing for them to use one on the floor.
My idea would be to ask the mom or dad to suggest what to get for your house to help with training.
Toilet training is smoother when it all looks and feels the same for the toddler. They just have to figure out how to control their body functions, not how the "equipment" looks or works differently in different locations. just an idea to consider.
I'm sure it will be very successful in your house no matter what you provide for the child. Toddlers loved to show off their new growing up skills for grandma.