In the current scenario ece at nit warangal is better any day thanks to the historical legacy of the college while the other two are comparatively newer colleges moreover nit warangal ece is one of the top branches of the institute in terms of placements as well and most of the tech companies allow ece students to sit for there placements. Moreover if you work hard in your first year you might get your branch changed to cse which will be great for you but the final decision is yours.