Honestly, I don't see anything new on SXP, its service is almost everywhere in crypto. Aside from that, it was recently pumped so getting in today will make you wait a long time before getting a huge profit. So this does not fit if your aim is a short term investment. About Ontology, I think it offers more innovation on the table than SXP and the market had been on a long sideway after its ATH way back 2018. If you ask me to choose from these two, I would choose Ontology for a short term investment. I feel that this will be pumped soon.
SXP is also a payment card project similar to CRO. Currently, the financial market is not yet back to excitement. In the next few years when people tend to use more payment cards, SXP has the advantage of providing good cashback. This will increase the scarcity of SXP through token holders.
One more thing is that they have DEFI, which buys back tokens every month to burn with the profits of SWIPE's payment card service, so there will be fewer and fewer SXP tokens. This project is good for long-term investment.