Hello,
Both are different engineering entrance exams which gives admission in engineering colleges.In my opinion,You can go for UPSEE entrance exams as there are many good colleges under upsee which has excellent placement records when compared to CUSAT.
For more details visit the below given link :
https://engineering.careers360.com/exams/upsee
https://engineering.careers360.com/articles/cusat-cat
Good luck.

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