Mathematically, 8.7 is greater than 7 (8.7 >7) but it goes more than just mathematical comparism for me to settle as a consumer that ucweb 8.7 is definitely better than opera 7.
Note that after this Opera will refer to Opera mine 7.0 and Ucweb will refer to Ucweb 8.7.
Even though Opera mini 7 has tabbed browser,It is nothing compared to the amazing power experienced with Ucweb 8.7.When you open up to three tabs on Opera it hangs,as if that is not enough,the tabs that have been opened beforehand are closed by Opera.Now come to Ucweb,you get to open up to 14 tabs simultaneously without hassle.There is no loss of content on web pages.
Another plausible feature of Ucweb is the offline download feature(which has been incorporated in earler versions).What this feature does is that it fetches your download to the "ucweb cloud" and you download it.So you get faster downloads.
One other thing is the pause feature.When downloads stop on Opera you have to restart,but when such happens on Ucweb you just hit play and hopefully you get to start your download from where you stopped.
Opera is cool though because sometimes I still find myself going back but for now it is a YES for Ucweb.
N.B This article refers to browsers on java phones(j2me) such as nokia and the likes.