Both JNTUH and OU are very good and reputed institutes, but there is no certain answer to which one is better in terms of correction.

• They hire lecturers for correction from the affiliated colleges of the same university and they are paid per answer booklet. 
• They are given around 6-10 mins to evaluate each paper which you took around 2-3 hours to write down. 
• The correction will majorly depend on what the candidate has written in the answer sheet. 
• The answer script of JNTUH is generally very long compared to OU and this might be the reason why the evaluation is not very good at JNTUH. 
• It becomes difficult to properly check all the answers within 10 mins. 
• But now things have been improved a lot at JNTUH with the efforts in streamlining the things in the examination branch. 

Hence, there is no such clear winner on which correction is better, but if you write down your answers properly with good handwriting, then you are very likely to score good marks.