The bass is controlled but not lacking in the TMA-1s. The midrange is more forward sounding and heavier than the HD25s. The treble is more recessed than the HD25s... SO! To sum it all up, the TMA-1s have a darker sound signature, it isn't neutral in the slightest. If you have experience with other sennheisers, it is much like their general sound signature. TMA-1s are not really all that great for female vocal jazz or music that would suffer from a heavy midrange. Personally I don't think either is particularly superior. No matter what, the TMA-1 will be darker than the HD25s. You can compensate for this to a degree with EQ adjustment, but be aware that it will not make them brighter than the HD25s. The clamping force is less on the TMA-1sl. Durability is about equal I'd say. You can replace more on the HD25s, but the likelihood of replacing certain things is slim, in other words, what you can replace on the HD25s should never need replacing if you take care of them even a tiny bit. Also... the TMA-1s have clarity to spare. They are not really perfectly precise, but they are not meant to be, neither are the HD25s for that matter. DJ headphones are not meant for critical listening. Neither the HD25s or the TMA-1s are studio or reference headphones. Both have alright clarity and separation, but it is nothing to call home about.
Overall, I think that the HD25-1s MIGHT be a safer bet. The TMA-1s are the kind of phone you either will enjoy or hate entirely. Just read through this thread, you'll see a lot of that. If you can audition the both of them, I'd highly recommend doing so. I didn't have a chance to properly audition the HD25-1s, but went with the TMA-1s because I could get them for cheaper. I'm happy with my decision, because honestly, I find the HD25-1s slightly too bright to my ears (granted, I need to do a full listening with them with my own music, as I only listened to them in store for about 30 minutes...). The TMA-1s are too dark, but sound better when I EQ them.
You won't find many negative comprehensive reviews for either the HD25-1s or the TMA-1s. All comprehensive reviews are positive for both. My advice to you is read them and decide if you want a forward midrange, with a recessed treble (that can be compensated for with EQ) and punchy but controlled bass, or if you want treble with a slightly recessed midrange. Coming from Grado, I'd probably suspect you would want the latter.