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Hi,
1. Both drivers work perfectly under 64-bit Windows 10 systems but not in 32-bit versions (except Win XP) and they are still the best working drivers. Opposite to your statement, I frequently look for new drivers but better ones do not exist. That's a question why anybody use 32-bit Windows systems in 2016 - completely pointless.
2. You always have to make an Android version upgrade with clean install, regardless of the installing method. The OTA update also will clear the old user data. However, that's not an obligation to upgrade your phone or use SP Flash Tool. Both of them are just possibilities for those ones who find them useful. The backup and restore function works as Google provides it, you can restore your apps and settings at the startup after flashing your phone.
3. We don't know that in advance (yes or no, both are possible) but generally if you root your phone, that's better to keep SPFT as your updater tool.
Sincerely,
Ben
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