Hey,

Both are good options to go for as they are reputed. Guru Nanak college has the benefit of a city location but is a private college while a government college is always more sought after for less fees. The studies are more or less of same quality in both institutions though Guru Nanak is more well known. You may choose based on your priorities like location, fees etc.

https://www.careers360.com/colleges/guru-nanak-college-chennai

https://www.careers360.com/colleges/government-arts-college-coimbatore

All the best!