The personal attention can be really huge, primarily because team teaching can be VERY difficult on teachers, depending on how it's done. For the very simple reason when it's done by combining or swapping TWO classes, that instead of 30 names, and 30 personalities, and 60 some odd of parents/guardians, and 1 set of favorite kids and 1 set of problem kids... they now have 60 names to learn, 60 personalities, 120 some odd parents/guardians. Yes, the RATIO is the same, but the teachers have double the workload because they have twice as many students. It's a lot easier for average kids to get lost in the shuffle, and for bright kids to be entirely dismissed, because each of the teachers has double the work load to contend with.
It can be very difficult on parents as well. Being 'outnumbered' during parent teacher conferences, 2 people with very different personalities to have to be trying to touch base with on a regular basis, 2 different styles/ opinions about your child, touching base with one but not the other, miscommunication, etc.
Essentially there's double the potential number of problems, and very little recourse. There's also a double the chance of a terrible year being wonderful (aka *total* personality clash with one teacher, but the year is 'saved' because of the other teacher).
The way I've personally seen team teaching work best is
1) when a single class is split by 2 teachers on either a 3 day and 3 day schedule (1 day overlap with both teachers present). It's essentially a job-share kind of arrangement where the school gets the benefit of 2 teachers, a built in seamless sub, but only has to pay 1 or 1 & 1/4 salaries instead of 2. SU[PER common in southern california in the 80's when class sizes were 40+ students and there wasn't enough money or space for more trailers.
OR
2) when the 'team' is actually 5-8 different teachers that the children rotate through like middle school. A lot of gifted schools work this way. This is the model many public schools are trying to emulate, but they're starting out with MUCH larger class sizes, and greater educational challenges.