Once you get to know manga studio, it makes alot more sence
I can imaging toning in photoshop would be difficult cause of tone overlapping and erasing (I assume you use masks?)
Manga studio is ool cause it automatically masks and unmasks every tone layer you make so if you make a mistake, you don't have to match the pattern again- this is not only cool, but it means that the tone layer can ALSO be stretched, shrunk, tilted, and shifted to where-ever you want without relaying the tone- cause the MASK doesn't move, the TONE does. For this reason alone, I'd rather tone in MS
Bad points- VERY incompehensible to learn without a tut, and you need to learn the shortcuts cause there's about 5 windows you constantly need.
Good points are also that it works well with photoshop cause you can import and export to photoshop easily (you need to open programs manually so it's not automated, but that's ok) and you can convert pictures to tones too which I thought was cool. MS comes complete with a bazillion tone bases which is great once you've got a memory of WHAT tones you have to chose from, and you can change the colours of the tones to white or any colour you want- yes. Colouring in tones (would rather use photoshop at that point, but some think it's nifty- right?)
You can also do professional speed lines and zoom lines too. EASILY. MS is made SPECIFICALLY for a manga artist so the whole buis it there- I still use illustrator for speech, but that's cause it's in vectors and that's just HANDY.
Don't knock MS- I'm likeing it despite it's tough knocks. It's like Professor Mcgonagall- tough to please, but she'll stand by you till the bitter end if you play by her rules
Hope you're enjoying it BR! ^^