Let me count the ways..
So the presto 12.1.9 is being sent numerous ugly headers to remind the User to update to Webprick version.
This new Webkit can't yet add attachments to emails.
It has a 'Discover' page that is forced on Users & eats their Data plans, often bringing up the same news story over & over from different vendors, and is sloppily coded to hide a third of the lead photo...
Despite breaking Google's own 50Mb playstore limit by quickly ballooning to 78Mb, it then adds a cache of a similar size...
The browsing breaks font size on pages and makes quite a few sites look silly.
When closed, a sizeable suspicious lump of data is always sent..
Whilst there is another browser whose apk is just Kb, and does in fact get all of the above right.
What would you choose?