You should have an option for both. The two masses are not subsitute for each other. Easter Vigil does not make sense without the Easter Day mass. Both are part of the celebrations of the Triduum, the period of three days from Thursday evening till Sunday evening: so the celebrations would include Easter Day mass.
Also, ending your Easter celebrations with the story of the empty tomb at the Vigil mass somehow leaves it a little incomplete and begging for the coda of the story of Mary Magdalene’s encounter with the risen Jesus at the Easter Day mass.
I know that USCCB allows one to fulfill the Easter obligations by either mass and I understand the pastoral considerations but it is a little disappointing (but I don’t have a better solution). It is a common provision all over the world but many bishops conference choose not to make a definitive statement on that. Disappointly, the USCCB webpage for Easter Triduum did not include the Easter Day mass.
There was a period of time in my parish where the priests compounded the problem by having the same homily for both masses. Now, they make sure that the homilies on Saturday night and on Sunday morning are different. Our previous parish priest went further in having all four masses (two on Saturday night and two on Sunday morning) being different: evening mass, vigil mass, dawn mass and day mass, each with its own separate readings and prayers in the missal. An interesting experiment but I find it highly confusing. Fortunately or unfortunately, I don’t think anyone else noticed - I think it is a little sad.
This year, there will be only one Easter vigil mass, which is essentially more correct liturgically, I guess but it leaves a lot of practical and logistical problems - I hope we can sort it out otherwise we will have to revert to splitting the community into two again for the Holiest of Nights.