Scientific studies comparing the effect of different types of toothbrush in patients with orthodontic appliances show that electric toothbrushes have no significant advantage over manual ones, or vice versa. Both types are effective at removing plaque. Differences in effectiveness depend mainly on brushing technique rather than on the brush itself. If you are already used to a particular type of toothbrush, there is no reason to change. If you use an electric toothbrush with braces or aligners, there is no risk of the brackets or aligner attachments (buttons) coming off.
This answer is for general information. Your own case needs an examination by an orthodontist.