Which is the best choice for party invites - free ones with glued on insert or computer-printed that I have to pay for?

I am having a 4th birthday party for my daughter and the location provided free invitations. My handwriting is not the best (not the worst but computer writes better) so I printed up an insert that I was going to cut out and glue inside the free ones.

My coworker suggested I buy computer paper (the ones with the pretty borders) and do the whole thing on computer. She said that’s probably easier than cutting and gluing the free ones.

I feel like I would like to take advantage of the free invitations and utilize them, but I am open to ideas or suggestions.

Any suggestions on which is the better choice?