They are both awful, I’m a Londoner and commute accross the city - I’ve been using GP 4 Seasons for the last 2 years doing 75-100miles per week and averaged 1 puncture per quarter in London. Gatorskins were more puncture proof but rode awfully whereas the GP 4 Seasons feel great. However I’ve recently switched to Pirelli Cinturato VELO TLR’s as they appear to have similar rolling resistance but have a much thicker tread - most of the punctures I’ve had are large chunks of glass so hoping the additonal tread thickness will reduce those. Ride-wise the Pirelli’s feel as good as the GP 4 Seasons so will see how they go over the winter.
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If you don’t like the Gatorskin you won’t like the hardshell.
The Hardshel is a Gatorskin with an extra layer of puncture resistant material.
It also have extra protection on the sidewalls.
They are not great in the wet, but I’m extra careful with traffic when raining so no big deal to me. I’m already slow.
No big complaints with dry weather (keeping in mind the type of tyre choice)
I’m getting curious about the Centauro that @Henry_Lee and @bbarrera mentioned
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Pirelli Cinturato Velo TLR vs Conti 4 Seasons vs Conti Hardshell in the lab:
in the real world I hate the feel of Gatorskin and didn’t bother trying the Hardshell. Used the 4 Season during winter 2019-2020, and Cinturato the next winter and into summer. My favorite is the Pirelli run tubeless. No complaints about traction but these were training tires not racing tires.
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Another vote for the Pirelli Cinturato, I have used a pair of these for the past 2 winter seasons (not the same pair) and found them to be fantastic. Not the fastest but also not the slowest but very good in the cold and wet and extremely durable.
Little fairy tells me there are tan walls versions coming very soon 
Just mounted a set of Vittoria Rubino Pro TLRs… First impression is that they seem like one of better compromises between an off-season beater tire and a “race” tire. They definitely don’t feel bullet proof like a gatorskin, but if you want something a little sporty that is likely gonna last longer than a GP in the off season, I would recommend these.
They also offer a “control” version if your winters are particularly nasty.
A nice article to add to the discussion
Out of those 14 only 2 jump out as being tubeless (topic of this thread). Those are the WTB Exposure and Hutchinson Sector 28. I’ve tried the Sector 28 and liked the road feel but unfortunately had issues with multiple tires.
Specialized Roubaix. I had Hutchinsons 4 seasons before, but the Spesh feel faster, smoother, and seem to tolerate the rubbish on the roads better.
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picking up on @MadTuna post here are the rated tubeless road tires at BicycleRollingResistance. Keep in mind that not all tubeless tires on the market have been tested:
First 10:
Next 11:
When I’m looking to try a new tire I add a filter for minimum puncture score of 45 which is 2 below Conti GP 5000 TL. Because within first 300 miles of riding them, I had ride ending punctures that sealant wouldn’t fix on both the 5000 TL (47 puncture score) and Specialized Turbo RapidAir (40 puncture score).
At the other extreme is Cinturato Velo TLR with a 103 puncture score, and that tire has never failed me but you give up a lot of watts… something like 22W vs 11W for 5000 TL at the tire pressures I’m running.
Interestingly after buying the wider Bontrager Aeolus Pro 3V wheels (25mm internal, 32mm external), I struggled for a couple minutes and managed to put on 5000 TLs in 32x622 size (with Vittoria Air-Liners!). After 800+ miles on them no problems and I’ve run over some nasty stuff on the road. Either luck or because of the wider tires, I don’t know. Really interested to give the new 5000 S TR a try as Conti claims they are easier to install and have better sidewall protection.
28’s? Slicks? What is this thing you guys call winter?
- A Montrealer
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In NorCal what we call winter you would call spring 
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Looks like I’m the only one using Good Year Vector 4 Season tires!
Worked well last year and going to put them back on in the next few weeks.