Hey Sudip, Chandrashila is a Deorital chnadrashila peak Trek a d starts from dehradun and first camp is katgaon ... Where as Kedarnath is a Trek which starts from haridwar and the first camp is in Sari ... If you are thinking between two of them, then I would suggest you to take kedarkantha trek first as it's marvellous and much more beautiful if you go before April end as the winter trek here s awesome ... Happy Trekking Bro!!!