My verdict: the luxury of forms, but at what price.
Typeform invented conversational forms and the experience remains unmatched. One question at a time, perfect animations, total branding. But the price is hard to justify when Tally does 80% of the work for free. Reserved for cases where visual impression is really critical.
What I like less: high price (25 euros/month minimum), limited responses on basic plans, Tally offers 80% of features for free, the "wow" effect fades over time.
My advice: use Typeform when impression really matters (premium landing pages, important client onboarding). For the rest, start with Tally.