Determine the toilet bolt distance from the wall.
Things to consider:
1)Toilet seat height
2) Flushing power
3) Style
4) Amount of water used per flush
4A) some toilets have option for #1 and #2
5) Round or elongated bowl.
6) Noise level when toilet flushes.
7) Height of tank only if there is a counter above the toilet tank some homes have this type of counter.

I would get the most practical 2 piece toilet..

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