Limerick has good choices for places to eat and socialize and doesn't have the touristy feel of the other two. There are a good number of things to do there, but it is still a city vibe, so you need to think about whether that appeals to you. That said, there are other places nearby, such as Lough Gur and Killaloe that you could visit and not be in the city.
Clare is going the other way. It is much more rural, although Ennis is a decent-sized town. It contains a couple of Ireland's main tourist sites - The Cliffs of Moher and The Burren. The drawback of staying in Clare is a more limited choice for dining and drinking than the Limerick or Galway options.
Galway is a city with a good vibe, feeling a bit more like a super-sized Irish town than a city. There is great evening entertainment and plenty of food option. I never find there's a massive amount to do in the city, so if staying there, I would use its facilities in the evening, but take the day before to see the sights in Clare and the day after to explore Connemara (only really en route if you are heading to the western half of Mayo).
We visited Kinsale while in Blarney, but Bunratty Castle and village after Limerick but before Shannon is much better because it's still furnished whereas Blarney is a shell of its former glory. There is Blarney House but it was not open during August when we were there. We stayed in a B&B very near Bunratty. While there, you can drive to see the Cliffs of Moher. Simply stunning!!!
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