I have a few different types, some old and some new.
If I am literally just blocking up i much prefer my round ( button ) tipped because of the better finishes it gives. Also has more inserts than my other cutters and is slightly bigger.
Yes as mentioned you can get them with a decent rake on tips
Yes they do tend to look as though they are overloading sometimes, but what one or two may not realise just why.
If you take a face mill with say triangular tips set at rightangles to work surface and you put a 4mm cut on then you have approx 4mm off cutter tip in contact ( ignoring tip rads ).
If you did this 4mm depth of cut with the button tipped face mill using say 8mm ( for ease of calculation ) dia tips then you have 1/4 of the tips circumference in contact. Works out a tad over 6mm i.e 50% more area than the example above.
This logic applies to using round button tools in the lathe, as I like using them there as well when i can. I think its liken to what they term as broadcutting on a shaper etc.