Limousine bus to Namba (OCAT)orRapi:t train to Namba?

The short answer

For one traveler the Limousine bus to Namba (OCAT) is cheaper by ¥160. That does not change up to 8 travelers.

The Rapi:t train to Namba is quicker: 39 min against 50 min.

Limousine bus to Namba (OCAT): 06:10–21:25. Rapi:t train to Namba: 06:53–23:00.

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.
Travelers	Limousine bus to Namba (OCAT)	Rapi:t train to Namba	Difference
1	¥1,400	¥1,560	¥160
2	¥2,800	¥3,120	¥320
3	¥4,200	¥4,680	¥480
4	¥5,600	¥6,240	¥640
5	¥7,000	¥7,800	¥800
6	¥8,400	¥9,360	¥960
7	¥9,800	¥10,920	¥1,120
8	¥11,200	¥12,480	¥1,280

Where each one leaves you

Limousine · Kansai Airport Transportation Enterprise (KATE)Limousine bus to Namba (OCAT)

From: Terminal 1 bus stop 11, first floor; Terminal 2 stop 6
To: Namba OCAT bus terminal, at JR Namba station, on the west side of Namba
Luggage: Up to two pieces of luggage per person in the hold, tagged with a claim ticket.
Runs: 06:10–21:25
Journey: 50 min

Between 06:10 and 08:55 no bus leaves for Namba.

Seats are first come, first served; traffic can make the ride longer.

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.