Rapi:t train to NambaorKiwitaxi transfer to Osaka?

The short answer

For one traveler the Rapi:t train to Namba is cheaper by ¥15,074. That does not change up to 8 travelers.

The Rapi:t train to Namba is quicker: 39 min against 1 h.

Rapi:t train to Namba: 06:53–23:00. Kiwitaxi transfer to Osaka: hours not recorded.

Priced against each other

Whole-party totals · adult fares

What each costs for the whole party, in JPY. The cheaper of the two is marked on every row. The Kiwitaxi transfer to Osaka is charged in euros; its column is converted at the reference rate in its fare note.
Travelers	Rapi:t train to Namba	Kiwitaxi transfer to Osaka	Difference
1	¥1,560	about ¥16,634	¥15,074
2	¥3,120	about ¥16,634	¥13,514
3	¥4,680	about ¥16,634	¥11,954
4	¥6,240	about ¥16,634	¥10,394
5	¥7,800	about ¥19,675	¥11,875
6	¥9,360	about ¥19,675	¥10,315
7	¥10,920	about ¥19,675	¥8,755
8	¥12,480	about ¥39,350	¥26,870

Where each one leaves you

rapi:t · Nankai Electric RailwayRapi:t train to Namba

From: Nankai's Kansai Airport station, joined to Terminal 1's second floor
To: Nankai Namba station, after Tengachaya and Shin-Imamiya
Luggage: Space for large luggage by each door, and racks above the seats for small bags.
Runs: 06:53–23:00
Journey: 34–49 min

All seats are reserved: buy the ticket before you board, or pay JPY 300 more on the train.

Shin-Imamiya, two minutes before Namba, is the change for JR's Osaka Loop Line.

transfer · KiwitaxiKiwitaxi transfer to Osaka

Up to 90 minutes of waiting after the scheduled landing is included.

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