Well, Voltric 3 and voltric 5 are both low-end yonex racquets. However, they are very efficient and cost-friendly for those that are looking for rather cheap, head heavy badminton racquet. Voltric 5 is a full graphite racket, with some delicate designs and substantial amount of weight on the head. Whereas voltric 3, is also a full graphite racket,but just has less weight on the head.
If you take a look at the chart above, you'll be able to see that Voltric 3 is clearly head-light compared to Voltric 5, which is surprisingly, above Voltric 70, one of the high end yonex racquets out there. I would personally recommand Voltric 3 if you are a begginer, but if you prefer head heavy racquets, then go for Voltric 5. Better design, more power and comes with a full racquet cover, unlike Voltric 3 Hope this helps!