Not exactly.
K-1
More expensive than Immigrant Visa
Requires Adjustment of Status after marriage (expensive and requires a lot of paperwork)
Spouse can not leave the US until she/he receives approved Advance Parole (approx 6-8 months)
Spouse can not work until she/he receives EAD (approx 6-8 months)
Some people have had problems with driver licenses, Social Security cards, leases, bank account during this period
Spouse will not receive Green Card for many months after Adjustment of Status is filed.
A K-1 might be a better choice when 18-21 year old children are immigrating also
In some situations, marriage can affect certain Home country benefits, making a K-1 a better choice
A denied K-1 is sent back to USCIS to expire
Immigrant visa
Less expensive than K-1
No Adjustment of Status(I-485, I-131, I-765) required.
can immediately travel outside the US
is authorized to work immediately upon arrival.
receives Social Security Card and Green Card within 2 or 3 weeks after entering the US
Opening a bank account, getting a driver's license, etc. are very easily accomplished with GC, SS card, and passport.
has legal permanent Resident status IMMEDIATELY upon entry to US.