I would prefer CS in DCE rather than Textile in IIT delhi. The textile dept. in IITDelhi doesn't have a good placement record. The campus life of both DCE and IIT Delhi are almost the same with IITDelhi having a edge over the DCE.

But any day a degree in CS will help you immensely in future rather than a degree in textile. Do not go with the place, go with the degree in which you are going to graduate. Infact a degree in CS any day will have better a placements comparing to the textile and have a very good options for higher studies rather than textile.

Coming to the branch change in IIT Delhi, you should have very good CGPA (scale of 10) at the end of first year. The following regulations apply for change of programme at the end of first year.

(a) A student is eligible to apply for change of discipline at the end of first year only, provided he/she satisfies the
following criteria:-
(i) CGPA for general category student :≥ 7.50

(ii) CGPA for SC/ST/PH category student : ≥ 6.50

(iii) Earned credits at the end of first academic session : ≥ 40

(b) Change of the discipline will be permitted strictly in the order of merit as determined by their CGPA at the end
of first year subject to the limitation that the actual number of students in the third semester in the discipline
to which the transfer is to be made, should not exceed the sanctioned strength and the strength of the
discipline from which transfer is being sought does not fall below 90% of existing strength.

(c) For a student with CGPA 9.0 or more, even if a vacancy does not exist, he/she will be permitted to change
provided the strength in the discipline to which the change is being sought does not exceed by 5% of the
approved strength.

(d) A student with CGPA 9.0 or more will be permitted to change discipline even if strength of discipline from
which change is being sought falls below 90% of the existing strength.

(e) Stipulation of minimum credits and CGPA requirements will not be insisted upon for change of discipline to
a branch in which a vacancy exists and the concerned student was eligible for admission to that discipline at
the time of entry to IIT Delhi. However, requirements of credits and CGPA will continue to apply in case of
both general and SC/ST category students seeking change to a discipline to which the concerned student
was not eligible for admission at the time of entry to IIT Delhi.

Generally it is very difficult for a branch change in IITDelhi. You should work very very hard inorder to be eligible for the branch change into CS or electrical. So think of it and if you really think that you can work hard for the first year then go for the textile in IIT Delhi