As a life long fan of Massive Attack, Im afraid I cannot tell you of any other band I found to match (matter of taste of course) but there are plenty good ones with a similar vibe

• Tricky (of course, ex member of massive Attack)
• IAMX (first few albums)
• Sneaker Pimps
• The thievery corporation (earlier stuff is more similar)
• Portishead (good but very very melancholic)
• Goldfrapp (early stuff)
• DJ shadow
• Yonderboi (all three albums are amazing, less electronic but he has a very special sound)
• Ancient Astronauts
• Nightmares on Wax

So, some of these would actually sound similar, many just give me the same vibe… As in, if you are playing a list of all those, it should more or less blend together…