Counterpoint Research has announced the results of its analysis of the smartphone processor market during the second quarter of 2021 (2Q2021). They indicate that MediaTek "dominated" the space for those 3 months, taking a share of over 40% for the first time. On the other hand, Qualcomm did well out of the 5G baseband sector, thanks to iPhone sales.
https://www.notebookcheck.net/MediaTek-is-found-to-have-taken-its-biggest-share-of-the-mobile-SoC-market-ever-for-the-second-quarter-of-2021.568605.0.html
MediaTek circuits have always been cheap and efficient. They have also always been much bigger power hogs than Snapdragon and their software support is shockingly poor outside of China. Whenever you have a choice, it's worth taking the Snapdragon.