Hey there Francisco,
Welcome to planDisney and thank you for your question. It looks like you're headed to the Disneyland Resort tomorrow (at least from the time that I'm answering your question) - how exciting!
While you can
rent a stroller while visiting the Happiest Place on Earth, you can certainly also bring your own stroller instead as long as it adheres to the
Disneyland Resort's rules for strollers.
Specifically, if you are planning on bringing your own stroller, it must be no larger than 31" x 52". Additionally, stroller wagons in general are not permitted into the parks.
Personally, my family has rented the strollers offered at the Disneyland Resort before and found them to work great! Specifically, they were very easy to push - as in, they had a great glide to their wheels. That's an important factor for me as I have had strollers in the past that can be more difficult to push and seem to have more resistance in their wheels.
However, if you want to save the rental fee then I'd definitely recommend bringing your own as long as it adheres to the rules I posted above. We tend to bring our own when we visit the parks as well, which is nice because ours has a bit more room for storage of our park bag beneath the kids' seat.
I hope that helps, Francisco, and I hope you have a wonderful visit to the Happiest Place on Earth. Thanks again for your question!
Have a Magical Day,
Greg