Both can work, depending on how the pancake fits into your day. The intended situations listed by the manufacturer are a quick option after training, a snack during travel or at the office, and a more substantial bite than candy between meals. So you are not limited to a single time slot.
From a nutritional standpoint, the pancake provides whey protein isolate and egg protein, which are sources of the amino acids the body uses to build and maintain muscle tissue. Milk protein isolate in the filling adds extra protein and contributes to the creamy texture. This makes it a practical way to increase your protein intake without preparing a full meal. However, it is not a substitute for a balanced post-training meal if your usual routine includes one; treat it as a snack that can support a gym-focused eating plan.
The fibre content matters too: oligofructose and isomaltooligosaccharides slow digestion and help the snack feel filling for longer than a typical sweet bar. That can help when you need something to hold you over until your next meal. Because total carbohydrates are relatively low, it also fits more easily into a moderate-carbohydrate approach than most confectionery. Still, it contains sweeteners, so check the nutrition label if you track sweetener intake carefully. If you are pregnant, breastfeeding, have a chronic condition, or take medication, consult a specialist before making it a regular part of your diet.