I dont think i can make better Wizard Spellbooks without Wizards Tower.
With Wizards Towers i can include a "toolbox" of different attack spells, so im better prepared for "any odd situation" there might come up.
I don´t really run Wizards Tower to nuke people to death, its the flexibility and the ready marker, thats so atractive. Heres a list of some spells i would like to have unlimited access to:
5 Acid Ball (armor removal) r 0-2
5 Arc Lightning (daze/stun+etheral & unavoidable) r 0-1
5 Flameblast (unavoidable) r 0-1
9 Force Hammer (slam, etheral, conjurations) r 0-2
4 Geyser (daze, unavoidable, antiburn) r 0-1
4 Jet Stream (push, etheral, flyers) r 0-2
5 Surging Wave (slam+push, extinguish, unavoidable) r 0-2 nonflyers
6 Windstorm (push, sweeping, unavoidable, flyers, etheral) r 0-1
Relying to much on Wizard Tower is a danger, as you could end up without attack spells, because your Wizard Tower got smashed with your last copy of an important attack spell or because Wizard Tower is out of range of your desired target(s) Thats especially true for the range 1 spells on my list.
I think you could make a Blasting Banker without Wizards Towers and still do quite well, several copies of Fireballs/Acid Ball and leave home without all of the utillity spells.