I'll try to focus as much as possible on the Handheld since as of now the only 8th gen console that I own is a N3DS but I'll give some my 2 cents on the Consoles aswell.
First of all I think that overall the 8th gen is pretty amazing, while some might argue that companies tend too much to make ports/remakes/sequels to already established franchises I instead see lots of acclaimed new faces i.e. Bloodborne and Splatoon. Moreover I think we have finally reached the point where Indie titles can recieve the recognition that they deserve if they are good enough, major examples beeing Rocket League, Shovel Knight and most of the Kickstarter projects. Also while graphical improvements are slowing down for obvious reasons I see huge improvements on the games dimensions, while some argue that the dimensions of the world of a game don't matter and instead leave the player with an empty experience I've seen lots of games delivering with enormous worlds (see The Witcher and Xenoblade X) and still offering plenty of things to do in every place which in a Console market that is likely to get games to cost 70/80$ in the next few years is reassuring that at least we'll get to pay more for longer experiences...
3DS imho is my favourite handheld EVER. Probably a huge change that causes me to think so is that in the last few years I've been free to make my own purchases as opposed to when I was a kid but nonetheless it made up for a far superior experience. All of the games I have delivered with great gameplay and made me so happy of my 3DS purchase that I decided to buy a N3DS as well about a year ago.
