SQR : - Can generate Reports in SQR.
- No Restart Logic.

App Eng :- Can't generate Reports in AE.
- Built-in Restart Logic.

1. App engine is belongs to PeopleSoft whereas SQR is third party application.

2. App engine are easy to maintain from support prospective as it's reside inside Peoplesoft (PS) applications. For SQR we need to separately take care as its file server objects and hence difficult to maintain & upgrade.

3. App engine are very systematic to Develop and Debug. SQR are difficult debug.

4. SQR is mainly used to create Reports. By App Engine we can not create reports.

AE is very systematic as it is structured as Section step and Action. While
SQR is not systematic.

AE flow is easy to read and understand while SQR is not that easy.

AE is easy to debug as you can do line by line debugging. With SQR it s not
easily possible.

By using SQR you can create and maintain different reports which are not
possible in AE's.

APP engine will be updated automatically while SQR should be done manually.