Choosing the best IAS coaching in Allahabad can significantly impact your UPSC preparation. Based on recent evaluations, here are some of the top coaching institutes in Allahabad:

1. Dhyeya IAS: This institute is renowned for its experienced faculty, comprehensive study materials, regular evaluations, and support for both English and Hindi medium students. The fee is approximately ₹1,62,000​.
2. Drishti IAS: Known for its high-quality teaching and extensive study materials, Drishti IAS offers courses in both Hindi and English. The institute has a strong record of producing successful candidates and provides a range of resources including test series and personality development sessions. The fee is around ₹85,000 for the General Studies course​​.
3. GS World IAS: This coaching center focuses on interactive learning and uses the latest technology for teaching. It offers various courses including foundation batches and crash courses, and also provides demo classes​.
4. Saket IAS Academy: This institute emphasizes personalized attention and comprehensive study materials, conducting weekly tests and regular writing practice sessions to enhance students' preparation.
5. Chanakya IAS Academy: With a reputation for detailed and structured teaching, Chanakya IAS Academy provides coaching in both Hindi and English. They cover the entire syllabus within the stipulated time and offer additional resources like test series.

Each of these institutes has its strengths, and the best choice will depend on your specific needs such as medium of instruction, fee structure, and course offerings. It might be helpful to visit the institutes, take demo classes, and speak with current students to make an informed decision.