The real question when you change training app is not which one looks better: it is whether your history comes with you. With GiFit it does, and it takes a minute.
In the Hevy app: Profile → Settings → Export data. A CSV arrives by email. If Hevy has moved it, look for «Export».
Settings → Import from Hevy/Strong. Pick the file: GiFit works out on its own which of the two apps it came from.
302 exercises are matched on their own. For the rest GiFit already suggests the match: one tap accepts it.
Nothing is thrown away. Anything outside the catalogue shows up in a list with a match already suggested: accept it with one tap, or keep it as a custom exercise. Nothing disappears quietly.
Same steps, same file. GiFit also reads Strong's European export — the semicolon-separated one that many importers reject.
Download GiFit, import the file, and your whole history is where it was. No account, and no connection.