Looking for new Toilet Stool, Squatting for better elimination

I am trying to find an additional taller Toilet Stool.
For others looking for information my old LifeStep stool (no longer sold by Renew Life) is about 7.5 inches tall and when we upgraded to at taller ADA toilet (16.5 inches to the Rim and 17" to the Seat) I feel I need a taller step now so I still think a 9" size will work better for me. I'd think that the dimensions of both the user and the toilet as well as age and agility would all factor in choosing a Squatting stool. Others steps I found out there are the Welles Step The Welles Step - For Easier Defecation and the Ginacor HealthStep http://www.ginacor.com/

The UK Lilliepad, http://www.lillipad.co.nz/
and Nature's Platform http://naturesplatform.com/
sound like they might be the healthiest but I don't think my spouse would for the cost or the look and my knees would also most likely complain.
I am trying to decide between these options.

If anyone else has experience with them I'd appreciate knowing...I was leaning toward the Ginacor, HealthStep, but have been unable to find the height of that one, one reviewer noted the off white more beige color (I like pure white) and right now it lists as out of stock with Amazon anyway.

Still working on finding the best one for me.
I hope my research helps someone else too.