Kane is at another level in top scorers table really. However Guirassy's effort is even more attracting to me. He has played a really big role in Stuttgart's success this season by scoring around one third of the goals the team have scored. 
I expect him to be on the radar of big teams this summer definitely especially while he has a release clause of only 17.5 million euros.
Harry Kane is already a goal scorer, as his scoring techniques can be seen when he was playing at Tottenham and now he has still continued even in the German bundesliga so he is a nice player that can be productive to any team. Talking about Guirassy, this is also an important player that have been very active in scoring goals for Stuttgart and just like you said most big teams prefers a goal scorer and Guirassy can deliver in that regard so if he becomes an expensive player it would not be a thing of surprise again because he can prove his worth anytime, anywhere. I expect him to be on the radar of big teams this summer definitely especially while he has a release clause of only 17.5 million euros.