Although there is no issue in preparing for UPSC Civil Services Examination for outside Delhi candidates as you have an option of attending online Live classes of every institute. But if you want to enhance your preparations and do not wish to attend online classes, Delhi will be an option then and you can join a good institute. Generally Delhi, the capital city is considered to be the best when it comes to UPSC.

Choice is yours, choose the option which satisfies you best.

Good Luck