By early next year Im guessing another release of 7.3 will have occurred .. So If I was looking at it then I would be thinking 7.3 but if I found major issues in testing etc then I would fall back on 7.2.
Always best to get the latest release if possiable as it has the longest shelf life..
In TRIM 7.3 build 5210, end users cannot add notes within profile form. You will either have to give end users access to overwrite existing notes or use right click on the record -> Details -> notes to add to notes.