Both are long esters so they can be pinnined all at once or they can be split,some will argue splitting will give more stable blood levels but then again some wont.
Deca raises prolactin levels wich can cause "deca dick" running more test to avoid the problem is just masking it not fixing it. which is why you need to run caber,prami, or forma to keep prolactin levels in check
and to the op, I split my doses but either way will work fine as you can see from other posts. I ran deca at 300mg/week first go around and now 400mg/week this time and I definitely notice a difference. I was up 19lbs at the end of week 6 but I'm running eq as well