First thing, share a photo so that I can understand more. If it is a mild spacing it can be corrected by both aligners or braces. Function wise they both are same. Only difference is, aligners are nearly invisible, less number of clinic visits and you can maintain good oral hygiene as you can remove aligner everyday for brushing. But braces are fixed so you can only remove it after treatment completion and there are chances of mild trauma to your cheek and lips due to wires and brackets. So if you can't bare the pain of small ulcers then go for aligners. Otherwise both do same function.
Next Steps
Consult a dentist for orthodontic treatment. Avoid doing filling method , because in future there are chances of discoloration of filling. So the best treatment is aligner or braces. Both give same result.
Health Tips
And try to know the reason for spacing. In some person spacing is because of high frenal attachment. So just check if you have high frenal attachment or not. If there is, then do the treatment for that first and then do ortho(clip) treatment