"strive to" - to attempt to achieve something "to struggle with" = to contest or fight against

So to put Jura's equations into practice, we will find that striving can be a challenge, but it is more likely enjoyable. It may or may not be something we enjoy. It is likely by choice. Struggle on the other hand, may be forced upon us - less likely by choice. It will bring us more grief, usually, because the difficulty is inherently stressful.