Depends on what its application is…learning as a 0a player, many throws of the 90s, heck even 70s and 80s hold up today for that style of play and many are as timeless as you can get. I’ve been collecting different yoyos as of late, ones that I never got as a kid but wanted and they all work pretty well today for this growing style of play (specifically focusing on the wing shapes). Speaking from yoyos in my classic responsives collection:
Superyo Renegade
Bumble Bee GT/(older) Duncan Dragonfly
Cold Fusion GT
Proyo/Duncan Profly
Tom Kuhn “Tomcat” (winged version of the SB2)
TK Sleep Machine (Feels like a bearing version of the BC winged yoyos mentioned below)
BC Blackbird and Apollo
No Jive 3-in-One - this is one of the holy grail fixies in the responsive community
Duncan Butterfly - also just such an icon and easily obtainable and dirt cheap, especially around the holidays and spring
Spintastics Manta Ray and Tigershark - I need to get hands on the Tigershark but Manta’s a really good throw and widely available.
Henry’s Viper - testing the waters with this one, it’s really feeling great with the wood transaxle. Also just a fun oversized responsive.
As for 1a - lot of iconic yoyos that are still a joy today. Pretty much anything One Drop has made in the past, same with CLYW and SPYY, and maybe a handful of YYF (Specifically the 888).
Duncan Imperial was the grail when I first started in 1969. [rEvolve rolls eyes] I have three now. Yoyo Factory Velocity was the one that got me back into the sport in the early Oughts. I still throw all of them, along with some moderns.
The tiger shark is basically a manta ray with a bearing. Of course you have to find the axle and bearing assembly to make one. Virtually all of the spintastic yoyos of that period used the same shells. The difference was in the cap configuration and/or the bearing assembly. Early Buzzon yoyos used the same shells.