Optical Discs

Looking on Amazon right now, I can get Verbatim BD-R 25GB 6X Blu-ray Recordable Media Disc - 50 Pack Spindle for about $40

However, the Verbatim Blu-ray Disc 50 pcs Spindle - 50GB 4X BD-R DL - Inkjet Printable are around $107

Now, for fairness, the 10 Verbatim Bluray 100gb BD-R XL Triple Layer 4x Speed Blu-ray Inkjet Printable Discs is $66.

Now, Price per Terabyte is cheapest at the 25GB level, however, I am also concerned about physical storage needs. Is it even wise to go for optical discs, if I am concerned about physical size, or am I over-thinking things? As someone with far more data than the average person here has, I know I need to be concerned about me not having any backups, but am I going about this the right way?