The Tower can represent a situation where an important decision has to be made. It can mean that there is a big change coming or that you have to face a difficult challenge. Also, the fact that it is upright indicates that you should take the time to think through your decision and not act on impulse. Furthermore, The Sun suggests that the decision you make will lead to success and future gratification. So, if you decide to accept the proposition, your outlook looks positive.
While The Sun suggests the decision made will bring success, The Tower may also indicate that there may be hidden risks. So, if you decide to decline the offer, you could avoid incurring some unknown risk in the future.
After considering the interpretation of the cards, my answer is that yes, you should accept the proposal. Both cards indicate that there is major change ahead and that there is a hidden risk to consider. However, The Sun suggests that if you decide to accept the proposition, you can expect great benefits in the future.