There is no wrong way or right decision; only what is most comfortable for you. If speaking aloud during your wedding is an unwanted load of pressure on an already full day, don’t do it!
On the other hand, if you are comfortable reading a vow you’ve written beforehand, here is a sweet template to get you started. Indeed, once you get started, feel free to throw out the template!
Lisa’s throwaway template:
(Name), I love you because. . . .
I love your . . .
I love that you . . .
And how you make me . . .
I promise that . . . .
And I promise to . . . .
Here are few more thoughts on your vows:
Length: At a minimum, five or six lines. At maximum, anything more than a page long is a little rough on your guests.
Tone: If you have gone through very difficult circumstances with your beloved, you can mention this, but overall try to keep everything in the vows positive and upbeat. If you are a funny person, it’s OK to add a touch of humor.
Secrecy: Some couples feel better if they know what each other will say, so they write or review their vows together. Others prefer to keep them secret from each other until the ceremony. If you choose the latter, try to give each other an indication of how long they will be, since it can be awkward if one had a few lines and the other has the beginning of a Russian novel.
Memorization: Don’t try to memorize your vows. It just adds another element of risk, and keeps you from being fully present during your wedding ceremony.
Finally, don't be afraid to try writing your vows. If they come from your heart, there is no wrong way to write them!