Recommendations:
If you only have one day to visit the parks and you are looking for a Disney atmosphere, it is better to go to Disneyland. Disney California Adventure Park is more like Six Flags with different attractions and rides, but still Disney themed. The ticket price in the summer season starts from $150 and depends on the date. You should reserve a date when purchasing tickets. There is also an option to buy express passes called Disney Genie+. These passes cost an additional $50 per ticket and allow you to skip the lines for most rides and attractions. This might be a good idea, otherwise you can spend more than an hour in front of each attraction. However, we recommend you to download the Disney app and book the attractions at the entrance to the park, because some of them are only available in an hour or more. Also, with these passes, you should be aware that you can only reserve one attraction at a time, and not all rides work with Disney Genie+.