Short & sweet question: Which makes more sense?

A planeswalker whose trademark spell is conjuring his own personal haven (a tower) and pulling a Riku and creating planebound (no spark) self-sustained copies of himself who can conjure this same tower and contribute to its contents, OR

A planeswalker who can magically pull others into a semi-substantial realm within his mind in a manner similar to the Meditation Realm and eject them regardless if those who exit are exiting on their home plane, or another?

I'm coming up with a custom character whose primary specialty revolves around the lesser known 'format' Wizard's Tower. As the titular 'tower' contains cards compiled from a number of various Magic packs, I surmise that would translate to said tower containing a library filled with a plethora of spellbooks from across the multiverse, a battleground/arena for magical battle, and perhaps other levels for leisure and study of artifacts (museumy?) and creatures (magical zoo?) and either individuals can enter/exit freely and if it's called upon by one of the walker's proxies, those inside travel with it, but with Rashmi's invention getting a lot of attention as a holy grail of modern interplanar technology, I suppose that's an overpowered solution, perhaps the tower merely simulates the exploration of other planes, or some other specific ways that multiplanar lands/mana bonds can be achieved by planebound visitors just as the spells and artifacts from other planes can be experienced.

I dont know exactly how the format works, but they second option seems a less complicated (in a good way). Is there any specific reason why it has to be able to deposit people not on their home plane?

Heck, maybe the tower could be sort of interplanar- people could enter (a version) from any plane, but it couldn't exit into a new plane.

http://magic.wizards.com/en/articles/archive/making-magic/wizards-tower-magic-format-2013-07-23

It's not so much important that they can be deposited, it's merely important he's a wizard, he has a tower, and that tower has everchanging multiplanar contents (and does not appear/exist on a single plane forever) so that, among other things, magical duels can be fought with spells (and artifacts, and mana bonds, and such) that were added to the tower's library/museum/armory/wherever land would be simulated, (perhaps similar to Newt Scamander's briefcase) drawn recently from another plane(s). I just think it's a bit more coherent that if the tower picks up these spells/artifacts/lands, that it must travel from plane to plane somehow, so figuring out how visitors actually experience the inside when it shifts planes is the trick.

Wouldn't it be the easiest solution to just say it's a building with a fixed location on a specific plane, but that it contains several different portals to other planes? Maybe the wizard/planeswalker inhabiting the tower likes to experiment with planar portals and switches them to other destinations from time to time. Or the inhabitant is just a planebound wizard who sort of inherited the tower from a planeswalker who set up the portals, and now the wizard uses those portals to study other planes that he normally couldn't? The people playing with the 'tower' deck could then represent wizards/planeswalkers who are chasing each other around that tower and through the occasional portal, picking up all manner of useful things on the planes behind the portals.