You will be just fine running 100% bio or heated SVO in a 7.3. There are quite a few guys running bio & SVO in a 6.0 & yes the 6.0 injectors are less tolerant then the 7.3 & the engine itself has been a turd for many. I beleive that with some mods the 6.0 can become a very reliable engine though.
I wouldn't say no to a 6.0 but I would prefer the 7.3.
I wouldn't say no to a 6.0 but I would prefer the 7.3.