To unite your team when divided on technology stacks and boost morale, foster an open discussion where everyone can share their views and concerns. Acknowledge the pros and cons of each option and involve the team in evaluating how each stack aligns with project goals, scalability, and team expertise. Consider running small experiments or prototypes to compare the stacks in action. Emphasize that the decision is about long-term success and collaboration, not just individual preferences. By promoting transparency, listening to all voices, and focusing on the shared goal, you can unite the team and reinforce a sense of ownership and motivation.

List out the objective pros and cons of each option. Pull together the main decision makers from each side. Influence with concrete evidence and data to get the team to go in one direction.

The best way to unite them would be look at the stacks they both are familiar with and find a way to use those frameworks. More experienced devs can improvise and learn the stack the juniors want to use.

In general, people like the technology they are experienced with. Schedule a regular call to discuss different use cases and discuss the pros and cons of the technology stacks. Assign collaborative tasks. Make cross skilling mandatory with target dates.

First, get everyone to agree that unity on the tech stack is better than everyone going in different directions. Then, have a deep dive with the whole team exploring all the different options and the pros and cons of each. Finally, the leader(s) need to make a clear choice of the direction to take, and any checkpoints of if/when we might discover that the decision was the wrong one, or circumstances have changed.