Honeymoon Kenya vs Tanzania debtate

Looking at two safari and beach options for our honeymoon - Tanzania in June or Kenya in December. We're definitely going to Fanjove island for the beach portion. In both we're staying at top notch properties/camps but I'm wondering if Kenya is something we should save for when we're older and have more time on our hands to add in places like Giraffe manor or have kids given the wider range of activities available on properties.

Tanzania would be a bit slower and less moving around the country. Looking at a night in Arusha, 4 nights at Laba Grumeti Art lodge, and 3 nights at Chem Chem.

Kenya would be lodges in the foothills for both Mt Kilimanjaro, Mt. Kenya, and a few nights in Maasai Mara.

Original itinerary included Rwanda gorilla trekking but chose to cut that out and save for another time.

Would love any thoughts or other recommendations. Total stay would be 2 weeks.