The shrub class can get confusing. For example the Buck rose Honey Sweet, my favorite rose is classified as a shrub, but has single hybrid tea type blooms. I wish that I could grow hybrid tea roses as hardy and disease resistant as Honey Sweet.
Another thing that I wished that I knew when starting to grow roses - miniature roses have tiny leaves and flowers. Many of them are also tiny plants. Some, however, can get really tall but still have tiny leaves and flowers. Best to do research. Also, many of the grocery store minis are very hardy. I have some that survived for years in my garden and are still alive!
Another think that I learned the hard way, rugosa roses HATE being sprayed. They are happiest fending for themselves away from their fussy, well fed cousins.