I've been going through this very painful research for some time now. I was using BE2010 happily until I upgraded to Windows Server 2012 R2, which killed BE2010 as an option. Now I am faced with the same DLO v. Agent question with BE2014.
The frustrating part is that its not just a choice between two agents -- it seems to be a completely new workflow for DLO. WIth BE2010, everything was done from BE and backup jobs could backup servers and workstations. If I go with DLO, I lose that, yes? Is there any way to select backup selections in BE2014 using the DLO agents? Or do I have to use the DLO application to manage DLO backups? (Which means 2 sets of global exclude lists, 2 sets of Back-to-disk storage sets, 2 sets of jobs, 2 sets of everything?)
Also, if I choose to go with BE2014 agents instead of DLO, doesn't that mean about $1000 for EACH Windows 7/8 machine in my organization?! (a cost that I didn't have before in BE since you only paid for a RAWS license for Windows *servers*)