I am new at this platform. Please help me to choose an entry level bike for me.

It will be my first bicycle. I have no maintanence information. I want to use my bicycle for longterm. I want to know advantage and disadvantage of to others for these 4 bicycles.. Which one must I buy ? What do you advice ?

1- Kross Hexagon V2

Frame 6061 Aluminium
Colours ligthgreen; graphite; red
Size 15", 17", 19", 21"
Fork BRAVO-375
Speeds 21
Front Derailleur Shimano FD-TZ30
Rear Derailleur Shimano RD-TZ50
Front Break Alhonga HJ-806AD
Rear Break Alhonga HJ-806AD
Shifters Shimano Revoshift SL-RS35
Crankset SR Suntour CW10-XCC
Bottom Bracket Alfred Thun cassette
Chain KMC Z50
Casette Shimano frewheel MF-TZ21
Hubs front: Steel Paralax, rear: Steel Paralax
Tires Vee Rubber VRB-198 26x1.95
Rims Kross
Rear Shock -
Handlebar MTB153 steel
Stem TDS-C41-8
Seatpost SP-200 Steel
Head set
Saddle Selle Royal PU 6482
Pedals NATTY CS-225
Weight 14kg

Hexagon V2 MTB - Rowery górskie

2-Merida Matts 5-V

Model: 5-V Matts
The bike belongs to a group: Hardtail ATB
Size of frame: 16''- 18
Frame: Matts D / T 2009
Shock absorber / Fork: Matts D / T 2009
Cranks: V-Brake Linear
Front Derailleur: SR CW-XCC-T102-PBG 42-34-24 CG
Rear Derailleur: Shimano TZ30-42t
Shifters: Shimano RS31-3 / Shimano RS31-7
Brakes: / V-Brake Linear
Brake Levers: ALLOY LEVER
Wielotryb / Cassette: Shimano MF-TZ21 1914-1928
Hub front: Alloy QR
Rear Hub: Alloy QR
Rims: Double Wall Black / CNC
Front tire CST C1348 2.1
Rear tire CST C1348 2.1
Pedals: PP pedal
Handlebar: XM CEN Steel Rise 580
Bridge: XM Speed CEN 17
Saddle: XM Comfort Sport
Saddle: Alloy CEN 27.2

3-Merida Matts 10-V

Model: Matts 10-V
The bike belongs to a group: Hardtail ATB
Size of frame: 16''- 18
Frame: Matts DTV
Shock absorber / Fork: SR XCT V2 100
Cranks: SR CW-XCC-T102-PBG 42-34-24 CG
Front Derailleur: Shimano TY10
Rear Derailleur: Shimano Altus
Shifters: Shimano EF50-3s/7s
Brakes: V-Brake Linear
Wielotryb / Cassette: Shimano MF-TZ07 1914-1928
Hub front: Alloy QR
Rear Hub: Alloy QR
Rims: Double Wall Black / CNC
Front tire CST C1348 26x2.1
Rear tire CST C1348 26x2.1
Pedals: Merida PP
Handlebar: XM CEN Steel Rise 580 P. Hub Alloy QR
Saddle: XM Sport
Saddle: Alloy CEN 27.2

MATTS 10-V - MTB Hardtail - Merida Bikes International

4-Jamis Trail X1

Frame: Enduro II frame design, 7005 aluminum main tubes, replaceable derailleur hanger

Fork: CS Fork, alloy crown, coil spring, external preload adjust, 60mm travel

Headset: VP threadless, sealed, 1 1/8”

Wheels: Alloy 26 x 1.50” 36H rims, heavy-duty ATB hubs with QR, 14g nickel-plated spokes

Tires: CST ATB, 26 x 1.95”

Derailleurs: Shimano TX51 rear and TZ30 31.8mm top pull front

Shiftlevers: Shimano Acera ST-EF50 EZ-Fire Plus, 21-speed

Chain: KMC Z51

Cassette: 7-speed freewheel, 13-28T

Crankset: Forged alloy crank, 42/34/24 steel rings, 170mm

BB Set: VP bolt-type 3SB axle, 68 x 124.5mm

Pedals: ATB platform, hi-impact resin cage & body

Brakeset: Alloy linear pull type with Shimano alloy levers

Handlebar: Jamis XC riser, 6D sweep x 13mm rise x 620mm wide

Stem: Jamis XC threadless, alloy cap, 10D rise, 90mm (12-14.”), 100mm (16-18”), 120mm (19 -21”)

Grips: Kraton for trigger-shift

Seat Post: Jamis alloy micro-adjust, 27.2 x 300mm, with alloy QR clamp

Saddle: Jamis ATB with pressure relief channel, SL cover, protective front and rear guards

Sizes: M: 13”, 15”, 17”, 19”, 21” F: 12”, 14”, 18”

Color: M: Gloss Black or MX Green F: Pearl White

Weight: 31.50 lbs

2010 JAMIS BICYCLES - SPECIFICATIONS