description of a probability

It sounds like he's leaning toward A given that that is 70 whereas B is only 30. Personally, I'd do B.

I agree that he favors A 70% to 30% over B; however, I would demand a third option just to be on the safe side.

Lexically, the advisor is saying, "It is my medium strong advice that you do A" OR "you should do A".

It doesn't necessarily mean that the advisor prefers A, but it is the advisor's suggestion that A is the best choice of action.

If the advisor had wanted to give 30/70 for option A,

"You may want to consider doing A/do A".

A weaker sense of advice, say 20/80;

"You might want to consider doing A/do A".

Stronger than 70/30, say 90/10;

"You almost certainly will want to do A."