Like you said, George, the Taylor machines are perfectly suitable to the job and "need" no replacement.
That said, I have found the Gotoh 510s not only to be the nicest looking (truly subjective, eh?

) tuners out there, but utterly precise in their movement with zero "gear lash" (mechanical gap between gears) as you turn the key. These are the only machines I can personal trust to tune
down to pitch because every micro turn of the key translates to a precise/direct movement of the post. With every other machine I've used in past decades it has just because SOP to tune up to pitch because of gear lash. Because they are so precise in feel/action (and they look seriously purdy in antique gold), I had fitted them to previous Taylors, and even now my "keepers" all have the 510s ...because I'm geeky like that

Oh, and to your question, I've personally found the Grovers to be totally average and I'd just assume stick with the Taylor Pings, with the nod going to the Schallers if you're choosing between these two. Bottom line is these 510s are seriously well-machined tuners that you just can't go wrong with ...unless, of course, you prefer the look of others more

Edward