If by experience we're talking about sheer library available, nothing compares with the Wii-DS days. In terms of actual practicality, the Switch is definitively the better option.

Switch on its own with the ability to play a lot of games from the other combinations is probably the option I would recommend.
Buuut, I enjoyed gaming the most in the Wii - DS era. And a lot of games from that time is not playable on the switch. The DS strange design gave way to a lot of unique games that does not port over easy to systems of another family. And even if the Switch probably could emulate Game Cube and Wii games, so far it does not.
Pretty much anything on earlier systems and from WiiU is playable on the switch.
The only other real contender is the 3DS -era (WiiU not worth mentioning) but I never liked the 3DS much but at least it brought some unique experiences with the 3D.

How is this even a discussion?

The answer is Switch: play the same game on the TV and on the go.

Switch

Play docked on TV or on the go portable.

Strong first party lineup extended by NSO offerings (which I wish you could still buy but at least its there) and a decent third party line up.

A lot of cons to being a portable and home console combined if you are a one console owner that cares about third-party games and graphics/ performance.

It's Switch for me, and largely just because of the fact that it has both in one package. No separate software libraries. Pretty impressive for a handheld. All of their studios focused on one system. Over 6 years, all of Nintendo's output (I guess that's not really true for all six of the years, but you get the point) has been focused on one system. That's meant a lot of must play games.

I should add though that I am very disappointed in the joy con drift issue. Basically, the Switch's primary controller is trash.  That's a pretty serious problem, and I am especially disappointed in the relative lack of acknowledgment and a failure to take the pro-consumer action on the part of Nintendo.  But, if we separate this hardware problem from the overall enjoyability of the system, Switch gets the top spot. 

If we take Switch out of it, I probably have to go with Wii U and 3DS.  It's not because either of those systems were great. But, I don't feel like they ever had a point where both systems were great. Maybe Wii and DS, but I was never that into the Wii. Wii U and 3DS had some seriously great games, so they're going to get my second place vote. 

I agree. It's hard to look beyond the extraordinary depth and breadth of the combined Wii-DS library, not to mention all the unique experiences afforded by motion and touch controls.

But, man, Switch is really close. It's on its way to becoming the best system ever made, if it's not there already.

It’s a problem, but not one that warrants such a melodramatic reaction given it takes about 30 seconds to fix the issue.

What's the fix and if it's easy why doesn't Nintendo fix it? 

For someone that's reasonably talented fixing things, it takes several minutes, after spending money on parts and waiting for them to arrive or going to the store to buy them.  For other people, it is not doable except by paying someone that knows what they're doing.

If Nintendo were providing the parts for free, and had some well-produced, step by step, idiot proof videos for making the repairs, that would be one thing. But Nintendo is not doing that. Nintendo is only providing coverage beyond the original warranty to the extent that they have been forced to.

Also, Nintendo continues to knowingly produce and sell the faulty product. This is probably the biggest issue of all, wrt Joy con drift. 

Anyway, in my opinion, Nintendo has done a shit job of standing behind their product.