Can anyone recommend a good new toilet to replace our old one with constant problems? [View all]

The old one is over 30 years old. We have constant problems with the chain/flapper apparatus. Hubby is disabled so we have a lightweight accessibility apparatus that fits over the toilet, which which provide arm rests to help in getting up.A taller seat would also be good. But it has to be small. This is a second bathroom, ground floor. 28"x43"plus door, approximately. It accommodates a small sink with a pedestal, which is designed for a small half bath.

Any helpful advice would be appreciated! Thank you.