I prefer Niese over Fister, think he'll have a solid year and will be a much bigger help in the strikeout categories. He is the weakest active guy on your staff though. Chapman is undroppable in basically any format, forget about it with holds and K/9. It gives Dempster the edge too.
I'd take Fister over Niese all day. Since coming over to Detroit, he has a sub 2 ERA, a sub 1 WHIP , and a 63 to 6 K:BB ratio... in 12 starts.
Not to mention he was good in Seattle before he was traded, he just didn't get the W's because of the Mariners offense. He could win 15 games in Detroit when the offense gets going with outstanding overall numbers.