Computer Vision / Speech Recognition
These fall under signal processing and mostly you will find electrical engineers who are working in domain of speech recognition. The thing with computer vision is that it overlaps between both field.But as you mentioned you only have option of Electronics/Communications, Electronics is not much related to these field ,well in communications, we all use statistical signal processing which is also useful in speech processing and computer vision.

If you can get into Electrical Engineering(signal processing) that would be much better but out of these two I would suggest go for Computer Science if you plan a future in these field.