I was on Comm/Ent at Hastings. Frankly neither Comm/Ent nor HICLR is considered one of the top couple of journals, but either could potentially add some whammy to your resume. Comm/Ent's advisory board contains (or at least used to contain) some fairly heavy hitters in the Silicon Valley legal community, which could come in handy. I personally never took advantage of that, however, and I suspect HICLR might sound more impressive to some prospective employers. Ultimately I'd say the difference is sufficiently trivial that you should do whichever one sounds more interesting.