I know there is no perfect split, it's 90% effort and diet and that any training routine with some logic behind it ultimately works if given the chance. That aside my question is the following: I've done TBT and worked around a four and five day split but I would like to try a 2 day split now. I've considered upper/lower however I feel that this would involve too many movements on the upper day so I'd like to add a bodypart or two to the lower day. I've come up with the following and wanted to get feedback on which everyone though was better for strictly mass.

Day one: chest/back/shoulders

Day two: legs/arms

or...

Day one: chest back/arms

Day two: legs/shoulders

I know it's splitting hairs but I just was curious for feedback.

Thanks.