It's one of my favorite too. and if i offered these I would take Shapeshifting in a heartbeat. there are so many uses for this power

Ight ight. Imma go with shapeshifting then just because I prefer it over the rest.

I'd give myself a composite form made from the best traits and the appearance of an elf. I'll make myself evolve with Shapeshifting.

Shapeshift because of the power level of ben 10

Elasticity would be nice for its versatility

Having more of me would be unhelpful, given I’m not one to follow orders; Elasticity and Invisibility are next to useless in my life; and Invulnerability and Immortality(regenerative healing factor) are traps of lonely solitude after 70 years or so.

So I guess I’d want Shapeshifting.

With self replication you can literally run your own business or if you want to be a boxer you can train yourself no need for shadow boxing.

If i can shapeshift on Prototype levels then 100% shapeshifting. Elasticity and Invulnerability are tied for second

Self-Replication, mostly because I can duplicate myself without a mere limit. I can do my own thing at a pace and even have an army of myself if I ever went to battle. I would be linked to my duplicates, controlling their every move so I would most likely be able to win most battles. Elasticity is my second choice since I can be immune to most harm and even do multiple things while sitting down

Self replication for multiple jobs to get more money