The question is a bit vague as you did not mention the criteria or the branch for comparison so I will offer my neutral reviews.
Usually one considers parameters like curriculum, infrastructure, fees, placement, and brand name. Also, your skills and knowledge by the end of 4 years affect your rate of employability. One needs to have excellent industry connections and the tag of a good college to make him employable. That being said, Galgotias has a slight advantage over Amity as it has better placements and industry connections.
Ultimately I will say that if you have no financial constraints, go for Amity but if you want to earn your placement go for Galgotias.
Amity University is certainly better in comparison to that of the Galgotias College of Engineering and Technology (If there are no financial constraints regarding fee) mainly due to their placement stats and infrastructure. Major factors that can be considered for comparison are:
Fee Structure: Amity is comparatively much more expensive than Galgotias and should be considered as an option if there are no financial constraints although it does provide scholarships and education loan options (refer to their official website for the details).
Location: Since Amity is located at a prime location (i.e. near Noida Sector 18) it helps the students by providing them better exposure (especially for CS and IT students due to the presence of major IT firms) for internships etc. than that of Galgotias College of Engineering and Technology which is located in Greater Noida.
Placements: Galgotias College of Engineering and Technology lacks in terms of placement when compared to Amity University. Placement stats of both institutes are as follows:
AMITY UNIVERSITY (PLACEMENT STATISTICS 2019-20)
GALGOTIAS COLLEGE OF ENGINEERING AND TECHNOLOGY (PLACEMENT STATISTICS 2018-19)
Thus, Amity University can be considered a better option over Galgotias. Although since the final call is yours so it depends on you what to choose as eventually it’s your decision that will matter.