Supra Classic 2.5 vs 4.0

I purchased a Technics amplifer which is like new, so i am not doing my usual in changing the speaker terminals for better ones. I usually used the tellurium copper Mueller Electric terminals. The Technics terminals are the plastic twist type. I cant use my silver plated copper cables with those.

Supra are tin plated they are better for this. The Technics is 40/w channel and I will be using 1.5 meter 5ft per channel. The speakers are my ESM (modded) bookself.

I was steering towards Supra classic 2.5, though was curious what the extra size of the 4.0 would have on the sound, maybe thicker wire would be too bassy. My silver plated cable is 14awg, and the other is a combo of 14/16awg silver.