The former flips all the magic school related enchantments and potions around; mage robes/enchants now buff the potency of your spells, and the potions will decrease casting costs. In addition, skill scaling for spells is more effective, because you won't have gear that reduces casting costs.
The latter on the other hand, makes general improvements all-around. The effects of the mod are very basic, but they work incredibly well. It was actually designed to be used with the mod above, but can work finely without it.
Better Magic was built with the intent that you'd use it alongside tSSSSS. I don't consider it complete without it, so they work together great. Apocalypse adds new things, so it doesn't conflict either, just adds new options for casting.
Forgotten Magic adds 42 new spells to your game, each with 7 possible improvements to the spell, over 280 improvements in total. The level of the spells is capped at 4. Spells gain experience as you use them, which allows you to unlock a new effect each time they level up. These improvements, as well as the spells themselves can be combined for potential greater effects; itís up to you to decide where your true power and nature lie.
Can be a bit overpowered towards the end... But having spells that level and have their own separate added effect choices is neat. I personally made a fire/necro mage. Animated Dead and Fire Blast lasted me from level 5 to level 30 and kept up decently with Better magic and TSSSSS.
People are sheep they whine and bleet waiting for someone else to do all the work, then when it happens they celebrate like they single handily won a great war.
On top of the above mods, you can use this: LF Tactical Magic Combat http://skyrim.nexusmods.com/mods/17334
With this, you can store a spell that will be automatically cast on some condition. Don't worry, you will not be OP with this. It needs long cooldown and can only be active once. For example: You store Fast Healing, and it will be active when you got hit.
Just like Contingency and Adaptive Protection in Apocalypse, but at lesser power. Thus, a wizard should be very prepared before a battle.