I'm not clear if you're asking the question so that you can narrow your choice of amps but it isn't necessary to make the decision between EL34 and KT88 power tubes in advance. Quite a few excellent integrateds will let you use both those tubes, and many others. The Primaluna Dialogue is one, as is the Cary Sli-80.
If you're fairly new to tubes that's a really nice feature. Being able to change tube types lets you more easily match the sound to your other equipment and discover the sound you prefer. And tube rolling is fun.
The first tube amp I bought came with KT88, EL34 and KT66 tubes. Ultimately I listened primarily to 5881s and KT77s but someone else, with a different source, speakers and taste in music, would likely have had a different preference.
If you're fairly new to tubes that's a really nice feature. Being able to change tube types lets you more easily match the sound to your other equipment and discover the sound you prefer. And tube rolling is fun.
The first tube amp I bought came with KT88, EL34 and KT66 tubes. Ultimately I listened primarily to 5881s and KT77s but someone else, with a different source, speakers and taste in music, would likely have had a different preference.