I have been an iPad user for a few years, but resisted iphone until last month.
IPad vs Android tablet is a no-one brainer. You will be lucky to get one Android update on a device (tablet or phone), whereas IOS updates (improvements, evolution, security updates) are ongoing. Apps are better etc.
For phone, it really depends on whether you use the device primarily as a phone, or for more online stuff. If the former, hard to justify the steep price of iphone vs discounted last year's high end Android devices. But if you use the phone for online, then iphone IOS brings all the benefits listed above for tablets.