15400 vs 15500?

[lovewatches1987]

Hello all

I have 15400 for few years and feel nothing but love. 15500 has bigger open case back, love this feature. It's a bit thicker, not sure yet if I like this fact or no. 15500's movement has 32 jewels comparing to 40 jewels in my 15400. And a 70 hour power reserve comparing to 60 hours at 15400. Would you replace 15400 with 15500 if offered at retail? Thank you